Telescopic Cylinder Owner’s Manual WARNING: Read carefully and understand all ASSEMBLY AND OPERATION INSTRUCTIONS before operating. Failure to follow the safety rules and other basic safety precautions may result in serious personal injury.
Thank you very much for choosing a NorTrac™ product! For future reference, please complete the owner’s record below: Serial Number/Lot Date Code: ________________________________ Purchase Date: ____________________________________________ Save the receipt, warranty, and this manual. It is important that you read the entire manual to become familiar with this product before you begin using it. This telescopic cylinder is designed for certain applications only.
Table of Contents Intended Use .......................................................................................................................................... 4 Packaging Contents .............................................................................................................................. 4 Technical Specifications ...................................................................................................................... 4 Important Safety Information .................
Intended Use The NorTrac series telescopic cylinders are ideal for construction, mining, forestry, marine, demolition, military, material handling, agriculture, truck and trailer, loader, utility, and waste management. Packaging Contents • • Telescopic Cylinder Owner’s Manual Technical Specifications Item# Capacity Stroke (in.) Max Bore (O.D.) Bore 1 (I.D.) Bore 2 (I.D.) Bore 3 (I.D.) Port Oil Volume (lb.) Max. PSI Pin Diameter 66735 7-ton 108” 3.74” 3.35” 2.76” 2.17” 1/2” NPT 3.
was designed. • Use the right tool for the job. DO NOT attempt to force small equipment to do the work of larger industrial equipment. There are certain applications for which this equipment was designed. This product will be safer and do a better job at the capacity for which it was intended. DO NOT use this equipment for a purpose for which it was not intended. • Industrial or commercial applications must follow OSHA requirements. ⚠WARNING WORK AREA SAFETY • Inspect the work area before each use.
Specific Operation Warnings ⚠WARNING HIGH-PRESSURE FLUID HAZARD • Inspect hydraulic system regularly for leaks. • Hydraulic fluid escaping through even a pin-size hole opening can puncture skin and cause blood poisoning. • Wear proper hand and eye protection when searching for leaks. Never check for leaks with your hand while system is pressurized. Use wood or cardboard instead of hands. • Relieve pressure on hydraulic system before servicing or disconnecting hoses.
Disassembling the Cylinder 1. Un-thread the top screw on the rear cap (#23). 2. Remove the rear cap. 3. Drain the oil inside.
4. Knock the trunnion (#31) to force the inner piston rod (#32) out. 5. Take out the piston rod (includes a larger and smaller one). 6. Knock the inside edge of the piston rod to find the correct position of the inner support ring.
7. Remove the support ring. 8. Punch holes into the back of the inner groove. 9. You may also drill holes with a power drill.
. Rotate the inner back-up ring hole at an angle (using the process above) to remove the inner back-up ring (#9). 11. Take out the two piston rods inside. 12. Repeat steps 8, 9, and 10. Remove the back-up ring (#9) from the larger piston rod.
13. Take out the smaller piston rod. 14. Remove the #8, the #16, and the #19 BS seals from the larger and smaller piston rod. 15. The #18 back-up ring is at the other end of the piston rod. See the image below.
Reassembly Procedures 1. Place the 3rd stage tube (#2) back inside the outer tube assembly (#1) and install the collar (#6). 2. Place the 2nd stage tube (#3) inside the 3rd stage tube (#2) and install the collar (#7).
3. Re-thread the rod end (#13) onto the 1st stage tube (#4) and put the 1st stage tube (#4) into the cylinder. Be careful not to damage the seals while installing each tube. 4. Thread the rear cap (#23) onto the cylinder and tighten the hex set screw (#26).
Operating Instructions Operating Conditions • The maximum operating pressure must not exceed 2500 PSI. • The contamination level of the oil must not exceed 16/13/10 from the ISO standard 4406. • The acceptable temperature range is -40° F to 200° F.
Formula for Calculating the Initial Required Cylinder Force to Lift a Load: A = the distance from the center of the load to the center of the dump body hinge pin (inches) B = the length from the center of the cylinder base pin to the center of the dump body hinge pin (inches) Load (lb.) x A /B = Initial required cylinder force (lb.) Example: 50,000 (lb.) x 85"/166” =25,602 lb. = Initial required force (lb.
Example: 166(B) X 845(D)= 140 Approximate Required Stroke D Dump Angle 0.715 42 degrees 0.733 43 degrees 0.75 44 degrees 0.765 45 degrees 0.78 46 degrees 0.797 47 degrees 0.813 48 degrees 0.83 49 degrees 0.845 50 degrees 0.861 51 degrees 0.877 52 degrees 0.892 53 degrees 0.903 54 degrees 0.923 55 degrees 0.939 56 degrees 0.
After Each Use • When the cylinder is not in use it should be fully retracted to prevent the chromed cylinder shaft from becoming damaged. • Always store the cylinder inside to protect it against harsh weather conditions. • Fill the cylinder with oil to prevent internal corrosion caused by air condensation. Tilt the cylinder to make sure that all seals are completely in contact with the oil to avoid any premature deterioration of the seals.
Troubleshooting Failure Pressure loss. Possible Cause Corrective Action Pump is broken. Replace worn pump parts. Pump flow is too high. Plungers and gland nuts are jamming. Verify the pump is the correct model for the type of cylinder used. One or more stages of the cylinder stay open. Use a lower P.T.O. coupling. Pump is running too fast. Install a limiting device. Cylinder is leaking oil. Cylinder does not open or close smoothly. One of the stages does not work.
Parts List Part# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 31 Description Outer Tube Assembly 3rd Stage Tube 2nd Stage Tube 1st Stage Tube Collar Collar Collar BS Seal Back-up Ring Wiper O-ring Plug Rod End Wiper Back-up Ring Trunnion Quantity 1 1 1 1 1 2 2 1 1 1 1 1 1 1 1 1 Part# 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 32 Description BS Seal Wiper Back-up Ring BS Seal Wearing Band Wearing Band Wearing Band Rear Cap Bleeder O-ring Hexagon Set Screw Collar Collar Collar Washer Piston Rod Quantity 1 1 1 1
Limited Warranty Northern Tool and Equipment Company, Inc. ("We'' or "Us'') warrants to the original purchaser only ("You'' or "Your") that the NorTrac product purchased will be free from material defects in both materials and workmanship, normal wear and tear excepted, for a period of two years from date of purchase. The foregoing warranty is valid only if the installation and use of the product is strictly in accordance with product instructions.
Distributed by: Northern Tool & Equipment Company, Inc. Burnsville, Minnesota 55306 www.northerntool.
