TM 5-4210-227-24&P-1 TECHNICAL MANUAL ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOL LIST) FOR 85’ AERIAL LADDER FIRE FIGHTING TRUCK NSN 4210-00-965-1254 HEADQUARTERS, DEPARTMENT OF THE ARMY 20 FEBRUARY 1987
COMPLETE MANUAL TABLE OF CONTENTS Publication TM 5-4210-227-24&P-1 Section 1 2 3 4 5 6 7 8 9 TM 5-4210-227-24&P-2 1 2 3 4 5 6 7 12 13 14 15 Section Title Introduction/Tabulated Data Chassis Assembly Pump Assembly Ladder Assembly Hydraulic System Electrical System Pneumatic System Ladder Calibration and Adjustments Illustrations General Information Engine (less major assemblies) Fuel System and Governors Air Intake Systems Lubrication System Cooling System Exhaust System Electrical Equipment, Instrument
COMPLETE MANUAL TABLE OF CONTENTS (Continued) Publication TM 5-4210-227-24&P-5 (continued) Section 9 10 11 TM 5-4210-227-24&P-7 1 2 3 4 5 6 7 8 9 12 13 14 15 TM 5-4210-227-24&P-8 TM 5-4210-227-10 Section Title General Information Installation Instructions Troubleshooting and Service General Information Engine (less major assemblies) Fuel System and Governors Air Intake System Lubricator System Cooling System Exhaust System Electrical Equipment, Instruments and Protective Systems Power Take-off and Tor
FOREWORD Descriptions, instructions and parts listing pertaining to the Model QWT 85 are discussed throughout this manual under the general headings Chassis, Pump and Ladder. Foldout illustrations and schematics, other than those forming a part of a commercial manual are located at the end of this publication. The foldout format is provided in order that illustrations and schematics may be continuously refer-red to while the supporting text is examined and studied.
MAINTENANCE MANUAL SECTION 1 1. INTRODUCTION/TABULATED DATA 1.1. INTRODUCTION 1.1.1. TM 5-4210-227-24&P, Organizational, Direct Support, and General Support Maintenance Manual for the 85’ Aerial Ladder Fire Fighting Truck is divided into eight volumes. These eight volumes are further subdivided into specific sections consisting of both Government and commercial literature.
1.2 TABULATED DATA a) b) c) Fire Truck Federal Stock Number: Manufacturer’s Serial No.: Registration Nos.: Manufacturer: Model: Contract Number: Truck Length: Truck Width: Truck Height: Capacity or Payload: Shipping Weight: Ground Clearance: Weight Loaded: Front Axle Rear Axle 4210-00-965-1254 CM3653 through CM3664 Pierre Thibault Inc. QWT 85 DAAJ10-84-A218 459" 108" 138" 51,000 GVWR 43,880 10.25" 45,940 19,740 26,200 Chassis Manufacturer: I.D. Number: Model: Wheel Base: Duplex I.C.
d) e) f) f) f) g) g) Transmission Manufacturer: Model: Serial No.: Capacity: Allison HT-740 2510087501 7 1/2 Gals Firefighting Water Pump Manufacturer: Model: Capacity: Hale QSM FHD100 1000 GPM @ 150 psi Front Axle Manufacturer: Model: Capacity: Serial No.: Rockwell International FL 941 QX-70 20,000 lbs. N766718 1. 2. Front Shock Absorbers Manufacturer: Model: Duplex 7605-1258 Front Springs Manufacturer: Model: Duplex 7804-6731 Rear Axle Manufacturer: Model: Capacity: Serial No.: 1.
h) i) j) k) Alternator Manufacturer: Model: Amp.
p) q) r) s) t) u) Driver’s seat Manufacturer: Model: Type: Bostrom Four-Way Adjustable Standard Wheels Front: Manufacturer: Size: Rear: Manufacturer: Size: Firestone 22.5 x 16.5 Firestone 20 x 8.5 Tires Front: Manufacturer: Size: Capacity: Rear: Manufacturer: Size: Capacity: Goodyear 16.5 R 22.5 18PR 20,000 lbs. Michelin 12:00 R 20X - 18 P.R. 31,000 lbs.
CAPABILITIES Fire Truck Turning Radius - Inside 31.5’ - Outside 42.
MAINTENANCE MANUAL SECTION 2 2. CHASSIS ASSEMBLY 2.1 GENERAL The Truck Fire Fighting Ladder 85’ (QWT 85) has a hybrid chassis made up of a Duplex basic assembly and a body assembly manufactured by Pierre Thibault. The complete Chassis Assembly consists of a Chassis Subassembly, a Cab Assembly and a Body Assembly (see Figure 2-1). The components that make up the Chassis Subassembly and the Cab Assembly are listed under "Tabulated Data" in Section 1.
2.2 TAB INDEX A TAB index is provided at the beginning of the commercial section in Volume 2. If the information you desire concerns a body component not listed in the TAB Index, it is probably manufactured by Thibault and details of the assembly components will be found in the "Parts List.
MAINTENANCE MANUAL SECTION 3 3. PUMP ASSEMBLY 3.1 GENERAL DESCRIPTION The pump assembly consists of a Hale centrifugal, single-stage pump with power shift and electric priming, and a pump control panel. Also included are miscellaneous items such as an automatic pump relief valve, a foam system, suction and discharge valves and couplings and drain valves. Power for the operation of the pump is provided by the engine through the drive shaft linkage.
3.3 HYDRANT MODE Water is introduced into the pump by two 2-1/2" hydrant valves (9), located on the Pump Control Panel. Water may also be introduced to the Water Tower by a second pumper through the two valves (8) located at the rear of the truck. The panel intakes are Hale valves and are described, along with the pump, in the HALE pump manual. The two rear valves are similar in operation and are built by Thibault. For a parts breakdown of the Thibault valves refer to Figure 3-2.
3.4 STATIC WATER SUPPLY MODE Two 6" suction intakes (11) are located one on each side of the truck. A 6" Intake, to receive water under pressure, is located at the front of the truck and is controlled by a Thibault butterfly valve (13). A relief valve (14) controls the water pressure to the suction side of the pump. 3.5 WATER TANK MODE Water is introduced into the pump from the truck water tank (50) through a Hale 3" ball valve (7). For details of the water tank assembly (50) refer to Figure 3-12. 3.
MAINTENANCE MANUAL SECTION 4 4. LADDER ASSEMBLY 4.1 GENERAL DESCRIPTION The Ladder Assembly consists of a Turntable, a Substructure, three Ladder Sections, a Ladder Control Console, four Outriggers and two Outrigger Control Panels. The Turntable is supported by the truck Substructure which is positioned over the rear wheel assembly (see Figure 4-1). The Turntable assembly consists of a heavy gauge steel plate and a three-part bearing surface of high quality cast steel.
When hydraulic pressure is applied to the cylinders they rise, causing the ladder sections to rotate at the cradle and thus elevate the forward end of the ladder. The three ladder sections are nested, with Section Two nested in Section One and Section Three nested in Section Two. The ladder sections are manufactured of steel rails, separated by the ladder rungs, and are designed to slide over one another on nylon slides.
A safety rail (10) is attached to the sides of Section One to catch the rear end of Section Two if it should ever, by reason of excessive torque, become disengaged from the Section One rail. The second ladder section (see Figure 4-5) is nested into Section One and is free to ride over Section One on the rear mounted nylon slides (7) and the Section One Nylon Slides.
Clamped to the underside of ladder Section One is a telescoping pipe which carries water to the Water Tower. The second section of the pipe is clamped to the underside of the forward end of Section Two of the ladder and Section Three of the pipe is connected to the Water Tower located on the forward end of Section Three of the ladder.
9. Ladder Load Dial - Indicates inclination in degrees (O degrees to 75 degrees) and suggests maximum ladder extension permissible for varying load conditions. 10. Water Tower Nozzle Pattern Select Switch - Selects spray or fog mode for the Water Tower nozzle delivery. 11. Water Tower Nozzle Sweep Control Switch - Controls movement of nozzle left and right. 12. Water Tower Nozzle Elevation Control Switch - Controls elevation and depression of the Water Tower nozzle. 13.
. Ladder Extension Dial - Indicates, in feet, the length the ladder is extended. 22. Water Tower Pressure Gauge - Indicates water pressure to the water tower. A detailed description of the operation of the ladder controls is given under the heading "Ladder Hydraulics".
The Outriggers consist of the four main assemblies (see Figure 4-10), the main support (not shown), the hydraulic cylinder (1), the outrigger arm (5) and the foot pad (7). The main support is welded to the chassis and has an abutment on its lower end to provide a pivot position (3) for the outrigger arm. The upper end of the outrigger hydraulic cylinder is attached to the main support and the piston rod is connected to the outrigger arm (4).
Figure 4-11 is a composite illustration showing the complete ladder cable layout. The numbers in the square boxes indicate to which ladder sections the cables or pulleys are attached. This illustration is broken down into groups to support the descriptions in the text that follows. The arrow with a numbered box indicates direction of ladder section movement.
4.2.3 Ladder Retraction The ladder retraction cable (see Figure 4-14) is wound on the underside (clockwise) of the right-hand winch drum (1). It passes around the two pulleys on Section 1 of the ladder (2) which transfers it from the underside of Section 1 to the topside. It then passes around the two pulleys fastened to Section 2 of the ladder (3) which transfers it from the underside of Section 2 to the topside.
4.3 LADDER LOCKING PAWL ASSEMBLY 4.3.1 General The ladder is equipped with a Locking Pawl Assembly which is designed to take the weight off the cables when the ladder is extended. The pawl mechanisms are controlled by an operating lever located on ladder Section 1. The lever is connected to the Locking Pawl Assembly by a series of cables and pulleys (see Figure 4-16). 4.3.2 Description The number references in brackets in the following description refer to the call-outs on Figure 4-16.
The Locking Pawls are designed to allow ladder rungs to ride over the top of the pawls during extension, when the Operating Lever is unlocked by pressing them down under tension of their return springs (11). When the ladder rung has passed over the Locking Pawl, the pawl is returned to its original position by the return spring. When the Lock Balancer (4) rotates forward, it carries the Grooved Roller (3) forward at the same time.
With the Locking Pawl Assembly engaged, i.e., the Operating Lever pulled up, the Locking Pawls are protruding through the rails of the ladder section above, ready to engage in the rungs of that section as soon as retraction is executed at the Ladder Control Console. The ladder sections will retract until the Locking Pawls engage in ladder rungs.
4.4.2 Hydraulic System The oil tank, located on the vehicle chassis, has a capacity of 45 gallons, the amount needed to ensure the hydraulic system operates at maximum efficiency. The hydraulic oil level should be checked frequently. Refill as required. When the ladder is in regular service, maximum time between oil changes must not exceed 1 year. However, it is recommended that an oil probe be taken from the tank for analysis by an oil company laboratory. Oil should not contain flakes. 4.4.
b) Air: The hydraulic system and reservoir must be completely tight, except for a very small vent to take care of any overflow due to expansion of the fluid. Turbing oil indicates there is an improper amount of water or oil present. To determine if cloudiness is present, place an oil sample in a test tube for at least one hour.
4.5 LADDER TROUBLE-SHOOTING GUIDE PROBLEM 1. No hydraulic pressure a) PROBABLE CAUSE REMEDY PTO not engaged. a) Switch PTO to at either Outrigger. "ENGAGED". b) Ladder/Outrigger Selector Valve not b) Pull valve out to select Outrigger. pulled out. c) Electric/PTO Pump Switch not in c) Move switch to "Down" position. correct position. d) Pre-set engine rpm is too low. d) Increase engine rpm setting to a minimum of 1200. 2. PTO/Hydraulic Pump is noisy.
5. Ladder will not lower. a) Ladder overloaded. a) Reduce torque on the end of the ladder by retracting or reducing weight. 6. Ladder will not extend. a) Ladder inclination angle below minimum limit. b) Ladder is overloaded. a) Increase elevation before extending. c) Defective full extension micro switch. d) Manual by-pass valve is open. 7. Ladder will not retract. a) Locking Pawls are engaged. b) Ladder inclination angle too low. c) Ladder overloaded.
8. Ladder will not rotate. a) Turntable not level. b) Rotating relief valve set too low. c) Manual by-pass valve is open. 9. Ladder operates too slowly. a) Engine rpm too low. a) Level the truck bed with the Outriggers or move to more level ground. b) Set relief valve (see Figure 5-2, number 16) to 900 psi. c) Close by-pass valve (see Figure 5-2, number 19). a) Set engine rpm to 1200. NOTE: For adjustment of hydraulic pressure, and relief valves refer to Section 8.
MAINTENANCE MANUAL SECTION 5 5. HYDRAULIC SYSTEMS 5.1 GENERAL The main hydraulic pump (see Figure 5-1, number 1) is operated by a power-take-off (PTO)(2) from the truck engine. The PTO is selected by a switch located in the cab. When the PTO switch is moved to the "ENGAGED" position, a pneumatic circuit is energized which engages the PTO with the engine. For a description of the Pneumatic circuit refer to "Pneumatic System" Section 7.
the oil to return to the reservoir (1) via the filter (4). To prevent a build-up of excess pressure in the hydraulic lines, the check valve, which is part of the filter (4), allows oil to return to the Reservoir (1) if the filter is clogged. When the accelerator button on the Outrigger Control Panel is pressed, or the green Throttle Control Button on the Ladder Control Console is pulled up, the hydraulic oil follows the same path as described above and the Relief/Unloader Valve (14) opens a little more.
The relief valve of the outrigger control valve (50) limits the outrigger operating pressure to 1000 psi. To prevent ladder operation before the outriggers are deployed, micro switches (see Figure 6-7, number 150) at the outrigger control the current to the ladder control console.
From the flow valve, oil passes through the directional control valve to the overcenter valves (21) and passes via the check valve in each overcenter valve to the upper portion of the hydraulic cylinders (22). At the same time, the oil in the lower portion of the cylinders flows via the Proportional Valve (16) and hydraulic return lines to the reservoir (1).
The Bourdon Tube (24), which is connected to the right elevating cylinder, measures the pressure in the elevating cylinders. The Bourdon Tube operates a micro switch (see Figure 6-6, number 25). When the pressure in the elevating cylinders exceeds 1050 psi, the micro switch opens and the Automatic Stop Lamp (see Figure 6-6, number 26) lights.
Extension System - the Proportional Valve (16) that controls ladder extension and retraction operates in the same way as the Proportional Valves for ladder elevation and rotation. When the directional control valve in the Proportional Valve is opened in either direction, oil passes through the pressure compensated flow valve.
5.6 WATER TOWER NOZZLE ASSEMBLY HYDRAULICS The Water Tower Nozzle Assembly is built by Pierre Thibault and is designed to provide a water discharge of spray, or fog, at the tip of the ladder. It can be controlled remotely from the Ladder Control Console or directly at the ladder tip. The Nozzle Assembly (see Figure 5-3) is divided into the Tip (1), the Body (2), the Hydraulic Pump and Electric Valves and the Actuators (3) and (4).
MAINTENANCE MANUAL SECTION 6 6. ELECTRICAL SYSTEM 6.1 GENERAL The electrical system is described under the main headings Chassis, Pump and Ladder. The electrical wiring and components, other than those provided by Pierre Thibault Trucks Inc., are described in the manufacturer’s literature included in this manual. All electrical wiring installed by Pierre Thibault is described in Section 6.
6.2.2 Truck warning Lights (Figure 6-1) A bank of switches (Nos. 2 through 12), mounted in the cab, control the Truck Warning Lights and the Siren Brake. These include the external Warning and Spot Lights (Nos. 17, 18 and 19) and internal Warning Lights (Nos. 13, 14 and 20). The Compartment Light Switches (No. 16) are operated by the compartment doors and each controls a Compartment Light (No. 14). The Door Open Warning Light (No. 20) is controlled by a switch (No. 15) on each set of compartment doors.
6.3 PUMP The wiring used to control the dials, indicators and lamps on the Pump Control Panels is described under this heading. For numbered references to the Pump Wiring Diagram, refer to Figure 6-1. Power for the Pump Control Panels is provided through the 20 Amp Circuit Breaker (No. 1). The Panel Lights on each side of the chassis (No. 29), the Indicator Lights (Nos. 30, 31 and 36) and the Pump Compartment Lights (No. 28) are controlled by a single switch (No. 27) on the left-hand Pump Control Panel.
6.4.2 110 VAC Circuits Refer to Figure 6-3 for numbered references in brackets in the following 110 VAC description. Current for the 110 VAC Circuits is provided by the Dynamote Inverter located in the truck cab (see the Dynamote Manual for details of the operation and construction of the Inverter). Output from the Inverter goes to the 30 Amp Breaker (No. 2) in the Electrical Box (No. 1) and the 15 Amp Breaker (No. 4) in the Electrical Box (No. 3), both mounted on the rear fire wall of the truck cab.
The 110 VAC Cable is strung inside the top rail of ladder Section 1, from rear to front (9). It returns to the rear of Section 1 via a trough welded to the inside of the Section 1 rail (8). The cable is laid in the trough and then passes under and over a canted compensating pulley (3) mounted at the rear of Section 2. This pulley serves to change the direction of the cable from rear to front and to pass it from the inside of Section 1 to the inside of Section 2.
The Water Tower is located at the tip, or fly, of ladder Section 3. Movement of the Water Tower Nozzle is provided by a self-contained Power Pack (No. 3). Direction of movement and type of water delivery are controlled by two sets of switches, one located at the tip of ladder Section 3 and the other on the Ladder Control Console (No. 2).
The rate of the ladder elevation, depression, rotation, extension and retraction is controlled by the amount of current received by the Elevation, Rotation and Extension Solenoids (18), (19) and (20). The farther the Joysticks are moved away from their neutral positions, the greater the current to the solenoids, which control how much the Proportional Valves (see Figure 5-2, number 16) will open.
Ladder Extension and Retraction - when the Ladder Extension Joystick (1) is moved toward A+, current is directed via the Current Regulator (13) to the A side of the Extension solenoid (18), causing the corresponding Proportional Valve to open and the ladder to extend.
The solenoid-operated switches (34) and (35) are controlled by the Bourdon Tube Micro Swtich (25). When the pressure in the ladder lifting cylinders exceeds 1050 psi, the Bourdon Tube Micro Switch opens, causing the solenoid-operated switches to open. Current is cut to the A side of the Extension Solenoid (18) and the A side of the Elevation solenoid (20).
Ladder deceleration prior to maximum elevation and ladder stoppage at maximum elevation of 75 degrees are controlled by two micro switches (7) and (8) in the Elevating Cylinder Limit Switch Assembly on the left side of the ladder turntable (see Figure 8-10). As the ladder is elevated, a wire connected between the assembly and Section One of the ladder causes a camshaft to turn. A few degrees before maximum elevation, a cam lobe closes the deceleration micro switch (7).
The Outrigger Marker Lamps (No. 151) are controlled through a Flasher Relay (No. 152) and a 20 Amp Circuit Breaker (No. 157). The Outrigger By-Pass Switch (No. 161) and the switches which prevent ladder movement before the Outriggers are deployed (No. 150), are connected through the Solenoid Switch (No. 154). The Electric/PTO Pump Switch (No. 160), located on the Hydraulic Control Panel, powers the Electric Pump (Figure 5-2, No. 8) and controls the Pilot Lights (No. 163) through the Solenoid Switch (No.
MAINTENANCE MANUAL SECTION 7 7. PNEUMATIC SYSTEM 7.1 GENERAL For numbered references of the Pneumatic Diagram, refer to Figure 7-1. Air is provided by the engine air compressor through the Air Compressor Governor (9) to the Air Pressure Regulator (6). The engine air compressor operates whenever the engine is running. If the Engine Throttle Solenoid Valve (5) is closed, the air pressure will recirculate through the air compressor.
When the Pump Control Valve in the cab (3) is pulled out, air pressure from the Air Tank is applied against one side of the Cylinder Shifting Pump (8) and causes the engine drive train to disengage from the axle and the Hale pump to engage with the engine. When the Pump Control Valve is pushed in, air from the Air Tank is transferred to the opposite side of the Cylinder Shifting Pump, which causes the pump to disengage from the engine and the truck drive train to re-engage with the axle.
7.2 LADDER BED LOCK ASSEMBLY The Ladder Bed Lock is designed to hold the ladder on the Ladder Bed while the truck is travelling. It is controlled pneumatically and operates in conjunction with the PTO control switch in the cab. When the PTO Shifting Valve is switched to "ENGAGE" air pressure is transferred to the Air Cylinder Assembly (see Figure 7-2, number 12). This causes the piston in the Air Cylinder (see Figure 7-3, number 4) to move to the opposite end of the cylinder.
When the ladder leaves the ladder bed, a micro switch at the ladder bed closes energizing the solenoid of the Override Valve. The valve closes, preventing the flow of compressed air to the Parking Brake Control Valve. The Parking Brake cannot be released unless the ladder is returned to the ladder bed or the red Parking Brake Override Button is pressed. When the Override Button is pressed, current to the solenoid is cut and the Override Valve opens, releasing the Parking Brake.
MAINTENANCE MANUAL SECTION 8 8. LADDER CALIBRATION AND ADJUSTMENT 8.1 GENERAL Section 8 describes how the Ladder Assembly is calibrated and how adjustments are made to the Relief Valves, Limit Switches and Ladder and Dial Cables. To assist in locating components discussed in the text, all the electric and relief valves on the truck have been tagged with an identifying number, which corresponds with their identifying number on the hydraulic schematic (see Figure 5-2). 8.
8.3 LADDER OPERATION - FAST IDLE ADJUSTMENT The Fast Idle System is air activated. It consists of a Limiting Speed Mechanical Governor located on the engine governor cover. It is activated by air pressure controlled by the engine air compressor governor. The higher the air pressure the greater the engine RPM. The pressure is adjusted by a regulator located near the PTO (see Figure 5-1, number 3).
After adjusting pilot pressure, adjust the main hydraulic pressure. Remove the cap nut on the adjusting screw (see Figure 8-2, number 5) and loosen the lock nut. Turn the adjusting screw clockwise as far as it will go until it is difficult to turn. Tighten the lock nut and install the cap nut. Push down on the Ladder Elevation Auxiliary Control Lever (see Figure 8-2, number 6) to raise the end of the ladder above the lights on the cab roof.
Continue to press down the Control Lever and slowly turn the adjusting screw clockwise until the Hydraulic Pressure Gauge on the Ladder Control Console indicates pressure is 1300 psi. Tighten the lock nut and install the cap nut on the adjusting screw. 8.6 ROTATION - RELIEF VALVE ADJUSTMENT This adjustment is done with the ladder resting on the ladder bed. Remove the cap nut and loosen the lock nut on the rotation adjusting screw (see Figure 8-2, number 3).
8.8 CABLE REPLACEMENT If it is necessary to replace a cable, ensure the correct size and type is employed. Start with a cable the same length as the one being replaced and with appropriate fittings attached (refer to Part 3, Parts List). 8.8.1 Replacing Extension Cables With the ladder retracted thread the left Section 2 Extension Cable through the pulleys of the ladder as described in para. 4.2.2 (see Figure 4-11).
Thread the left Section 3 Extension Cable as indicated in Figure 4-13 and fasten one end of the cable to the left cable attaching bracket on Section 1. Thread the locking nuts on the ferrule, only until the end of the ferrule is flush with the end of the second nut. Extend the Second Section of the ladder, using the ladder hydraulics, until the rungs of the Section 2 exactly coincide with the rungs of Section 1.
8.8.3 Replacing the Locking Pawl Assembly Cables Refer to the description of the Ladder Locking Pawl Assembly in para. 4.3.2 and Figure 4-16. Install the cable (2) first by attaching one end to the Locking Pawl assembly at (10), threading the cable through the Balancer Assembly (4) and the other end to the Locking Lever (1). Ensure the Locking Lever is down in the unlocked position and pull the cable tight before attaching to the lever.
The distance that the Locking Pawls on Section 1 may swing up is controlled by the lug on the Section 1 Pawls and is factory set. Take note of the distance between the rung of Section 2 and the lower face of the Locking Pawls on Section 1 (see Figure 8-4, number 3).
8.9.2 Ladder Spacing Adjustment With the ladder retracted, check the spacing separating each Section. If the spacing between the sections is greater than 1/16" but less than 1/4", install shims at the nylon slides to reduce the spacing between the sections to 1/16". If the spacing between the sections is 1/4" or greater, remove the nylon slides and install new slides. 8.10 CALIBRATING LADDER DIALS AND LIMIT SWITCHES 8.10.
8.10.2 Calibrating the Limit Switches The position of the Limit Switch Activating Cams can be adjusted by loosening the set screws and sliding the Cam, left or right, on the Indicator Assembly Screw (see Figure 8-9, numbers 1, 2, 6 and 9). One cam has a lug which activates the limit switch controlling the ladder deceleration during extension. The same cam then trips the limit switch controlling maximum ladder extension (8).
With the Ladder on the Ladder Bed, check the wire from the Elevating Switch Assembly to the Ladder Assembly for slackness. If the wire is slack, loosen the cap screw that secures the wire to the Ladder Assembly and pull the wire just enough to remove all slackness. Tighten the cap screw. Check and adjust the Elevating Limit Switch Assembly. Elevate the ladder. At 70 degrees the rate of ladder elevation should decrease. When the ladder is fully elevated, check the angle of elevation.
To calibrate the Inclinometer Dial, first lower the ladder onto its bed. Loosen the set screw on the Dial drum (see Figure 4-8, number 2) and rotate until a 0 reading is seen in the Dial Window on the Control Console. Tighten the set screw. Check that the control cable is tight. If it requires tightening, loosen the clamp screws holding the end of the cable to Ladder Section 1 and, with pliers, pull the cable tight. Ensure the dial setting remains at 0 degrees. Tighten the clamping screws.
MAINTENANCE MANUAL SECTION 9 9.
FIGURE 2-1.
See pages 9 to 11 for identification FIGURE 3-1.
FIGURE 4-1.
1 Turntable Worm Gear Assembly FIGURE 4-2.
For Explanation See Pages 12 to 13 FIGURE 4-3.
For Explanation See Pages 13 to 14 FIGURE 4-4.
For Explanation See Page 14 FIGURE 4-5.
For Explanation See Page 14 FIGURE 4-6.
See Pages 15 to 17 for identification FIGURE 4-7.
For ident See Part 3 Parts Man. FIGURE 4-8.
FIGURE 4-9.
See page 18 for identification FIGURE 4-10.
FIGURE 4-11.
FIGURE 4-12.
FIGURE 4-13.
FIGURE 4-14.
FIGURE 4-15.
FIGURE 4-16.
1. 2. 3. Main Hydraulic Pump PTO Regulator Adjustment FIGURE 5-1.
FIGURE 5-2.
FIGURE 5-2-1.
FIGURE 5-3.
FIGURE 5-4.
FIGURE 5-5.
1. Hydraulic Pump FIGURE 5-5-1.
1. Control Solenoids FIGURE 5-5-2.
FIGURE 5-6.
FIGURE 5-7.
FIGURE 6-1.
FIGURE 6-2.
FIGURE 6-3.
FIGURE 6-4.
FIGURE 6-5.
FIGURE 6-6.
For Explanation See Page 41 FIGURE 6-6-1.
FIGURE 6-7.
FIGURE 7-1.
FIGURE 7-2.
FIGURE 7-3.
Figure 7-4.
FIGURE 7-5.
1. Parking Brake Override Valve FIGURE 7-6.
FIGURE 8-1.
FIGURE 8-2.
FIGURE 8-3.
FIGURE 8-4.
FIGURE 8-5.
FIGURE 8-6.
FIGURE 8-7.
FIGURE 8-8.
FIGURE 8-10.
FIGURE 8-9.
TM 5-4210-227-24&P-1 By Order of the Secretary of the Army JOHN A. WICKHAM, JR. General, United States Army Chief of Staff Official R.L. DILWORTH Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with Special List. U.S.
PIN: 060756 000
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