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EATON MODEL 11 HYDROSTATIC TRANSMISSION REPAIR INFORMATION

Table of Contents – Page 1 of 1

PRODUCT IDENTIFICATION AND ORDERING INFORMATION

SPECIAL TOOLS TO AID IN DISASSEMBLY/REASSEMBLY

GENERAL PARTS LIST

DISASSEMBLY/REASSEMBLY

BODY/COVER--DISASSEMBLY

BODY ASSEMBLY-DISASSEMBLY

MOTOR ROTOR-DISASSEMBLY

PINTLE ASSEMBLY--REMOVAL

PINTLE ASSEMBLY--DISASSEMBLY/INSPECTION

RELIEF VALVE--REMOVAL/INSPECTION

RELIEF VALVE--INSTALLATION

DAMPENING PISTON--REMOVAL

DAMPENING PISTON--INSTALLATION

CHECK VALVE--REMOVAL

CHECK VALVE--INSTALLATION

ACCELERATION VALVES--REMOVAL

ACCELERATION VALVES--INSTALLATION

PUMP ROTOR ASSEMBLY-REMOVAL/INSPECTION

CAM RING--DISASSEMBLY/INSPECTION

CHARGE PUMP WITH BUSHING--DISASSEMBLY/INSPECTION

CHARGE PUMP WITH BALL BEARING--DISASSEMBLY/INSPECTION

COVER ASSEMBLY--DISASSEMBLY/INSPECTION

COVER ASSEMBLY--REASSEMBLY

PUMP PLATE/PORT PLATE--INSTALLATION

CHARGE PUMP WITH BUSHING---INSTALLATION

CHARGE PUMP WITH BALL BEARING--INSTALLATION

CAM RING--INSTALLATION

PUMP ROTOR ASSEMBLY--INSTALLATION

PINTLE ASSEMBLY--INSTALLATION

MOTOR ROTOR ASSEMBLY--INSTALLATION

BODY ASSEMBLY--REASSEMBLY

BODY/COVER--REASSEMBLY

START-UP PROCEDURE

TROUBLE SHOOTING INSTRUCTIONS

FLUID RECOMMENDATIONS

Summary of content (23 pages)

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EATON MODEL 11 HYDROSTATIC TRANSMISSION REPAIR INFORMATION Table of Contents – Page 1 of 1 PRODUCT IDENTIFICATION AND ORDERING INFORMATION SPECIAL TOOLS TO AID IN DISASSEMBLY/REASSEMBLY GENERAL PARTS LIST DISASSEMBLY/REASSEMBLY BODY/COVER--DISASSEMBLY BODY ASSEMBLY-DISASSEMBLY MOTOR ROTOR-DISASSEMBLY PINTLE ASSEMBLY--REMOVAL PINTLE ASSEMBLY--DISASSEMBLY/INSPECTION RELIEF VALVE--REMOVAL/INSPECTION RELIEF VALVE--INSTALLATION DAMPENING PISTON--REMOVAL DAMPENING PISTON--INSTALLATION CHECK VALVE--REMOVAL CHECK V
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Eaton Hydraulics Division Model 11 Eaton Hydrostatic Transmissions
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Contents Product Identification and Ordering Information Exploded View Part Description Disassembly- Reassembly Procedures 5 6 7 8-21 Acceleration Valves-Removal Installation 11 11 Body Assembly-Disassembly Reassembly 8 21 Body/Cover-Disassembly Reassembly 8 21 Cam Ring-Disassembly/lnspection Installation 12 19 Charge Pump with Bushing-Disassembly/lnspection Installation 12-13 17 Charge Pump with Ball Bearing-Disassembly/lnspection Installation 13-14 18 Check Valves-Removal Installation Cove
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Product Identification and Ordering Information Refer to specific listing covering your Eaton transmission. Parts listings are available from the Hydraulics Division, Minneapolis Plant.
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Charge Pump with Bushing I 24 Acceleration Valves 40 9’ 39 I 38 \ l4 .
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General Parts List Item No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Description Cap Screw, Socket Head Cap Screw, Socket Head Oil Seal Charge Pump Body Seal Ring, Square Cut Roll Carrier Pump Plate Port Plate Seal Ring, Square Cut Shield Snap Ring Retaining Ring Snap Ring Bearing (Input) Cover Button Dowel, Pivot Pin Drive Pin Dowel (36 Dia. x 2” Lg.
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Disassembly/Reassembly 2 Separate the body from the cover. If the cover' does not separate easily from the body because of' fluidseal, tap the body and/or cover with plastic hammer to break the seal. Important: The motor ball piston assembly must remain intact as the ball pistons are matched to the motor rotor. A large rubber band may be used to retain the ball pistons in place during handling. Body Assembly-Disassembly Retaining Ring Sealed Bearing Fig.
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linecontactthe 4 Inspect motor of the ball pistons-on Rotormust area contactThis in body. ated racemotor the If free completely and be smooth irregularities. any of any irregularities are noted, replace the motor race. Motor Assy. Note: If irregularities are notedin the motor race, it is reasonable to assume that one or moreball pistons and rotor bores will also be damaged. Fig. 7 Motor Rotor Assy. Pintle Assembly- Removal Pintle Assy. Cover Assy. ubber Band Fig.
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Relief Valve-Removal/lnspection Dampening Piston-Installation Plug Valve Relief 15back-up Install nearest new rings smooth to the piston face andO-rings in grove on a new piston. 16 Lubricate outer surface of the pistons. Press pistons (smooth face up) in bores in pintle to the bottom position. Ball Check Valve-Removal Note: Removal of check valves is not necessary if check valve balls move freely and seat properly. Fig. 10 11 Use a 1/4” allen wrench to remove relief valve plug.
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Check Valve-Installation 20 Install retaining ringsand check valve balls in bores of pintle. Pressnew check valve bodies in bores. Press far enough in for coil pin clearance. Important: To prevent dislodging of retaining rings do not drive check valve bodies into bores. 21 Press coil pin into pintle until flush withor slightly below surface. 3/16" Dia. Rod Fig. 15 Acceleration Valves- Removal Note: Not all models have acceleration Replacevalves.
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33 Slide the cam ring from the pivot pin and control Important: Use a pressto install check valve bodies. Driving them into position may dislodge the retaining rings. shaft in the cover. Then lift ring from the cover. 34 Remove the control shaft insert. 31 Press or drive the coil pin in to flush or slightly below pintle surface. 35 Inspect area where the ball pistons contact the race. This: area must be-smooth and completely free of irregularities. If it is not, replace the pump race.
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40 Removethesquarecutsealfromthechargepump housing. 51 Use 1/4” allen wrench to removefivecapscrews. Fig. 21 41 Press or drive the oil seal from the charge pump Important: Be careful not to damage the input shaft bushing. Fig. 23 Top Snap 52 Use a modified two jaw bearing puller, pulling against the two notches machined in the housing to remove the charge pump assembly. Ring Carrier Rolls (6) Important: Do not pound on the bearing puller while removing the charge pumpbody. Apply a steady pull only.
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62 Reposition cover assembly as shown in Figure 27. Then remove input shaft. Snap Important: Be careful not to damage the inputshaft bushing in the cover. Carrier Rolls (6) 63 Inspect, input shaft for stripped keyways or other irregularities. If found, replace the input shaft. 64 Inspect, bushing locatedin face of cover for broken bushing or other irregularities. If found, replace the cover. Oil Seal Fig. 26 55 Remove six carrier rolls. Ass’y 56 Remove snap ring. Fig.
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69 Turn coverover.Usedimensionobtained in Step 68 to locate dowel pin in cover face. Drill 11/32” diameter hole at center point of dowel pin. Drill hole exactly in line with center of shaft. Control Shaft 73 Press new dowel pin through the shaft. Leave 11/4” of dowel extending from the shaft. 74 Lubricate I.D. of new oil seal with clean lubricant. Then pressor tap seal in bore until completely seated. Same as Dimension measured in Fig. 29 Fig. 30 70 Press damaged pin from control shaft.
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Port (Inlet) Plate Outlet r Fig. 36 77 Lightly lubricate new square cut seal and installin seal groove in cover. Pump Plate (or Port Plate) Outlet Outlet Identification Seal 16’ Cover Fig. 37 Pump Plate/Port Plate-Installation specific 78 Install pump plate or port plate on cover. Either side of the pump plate mayface.the cover regardless of input rotation. However, the port plate must be installed 38.
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ard lip 79 Forcounterclockwise(CCW)rotation,theletter A 82 Installsnapringinuppersnapringgrooveininput mustbeup,facingthechargepump.Forclockwiseshaft(againstcarrier). (CW) rotation the letter A must face down toward the Snap Ring cover I Charge Pump with Bushing-Installation For charge pumps with ball bearing, see Steps 89 through 94 for installation. Installsnapringinlowersnapringgroove(against plate) of input shaft. Snap Ring Carrier Drive Lower Snap Ring Groove Fig. 39 Fig.
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86 Align charge pump dowel pins with holes in cover. Then guide pump over shaft, carrier and rolls until pins engage holes. 90 Install carrier over input shaft with side marked "up" (see step 57). Be sure keyway in carrier fits over carrier drive pin in input shaft. Important: Protect oilseal lip from keyways, snap ring grooves and shaft splines. Important: For correctcarrierrotationtheleading edge of carrier must rotatein the same direction as the input shaft. Install as shown in Figure 48.
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94 Align charge pump dowel pins with holes in cover. Protect oil seal lip from keyways, snap ring grooves and shaft splines. Then guide pump over shaft, carrier and rolls until pins engage holes. Retaining Ring Screw (4) Fig. 53 Charge Pump Housing Important: Input shaft should rotate freely by hand. If it does not, recheck installation. Cam Ring-Installation 100 Install 2 buttons in the cover as shown in Figure 54. Cam Fig.
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Pump Rotor Assembly-Installation 103 Align the slot in the pump rotor with the input shaft cross pin. Install rotor assembly on shaft. Important: Keep rotor assembly intact with wide rubber band. Remove rubber band after installing rotor assembly in cover assembly. Important: Do not force pintleover rotor assembly. It isa slip fitand the pintle must turnfreely by hand. Ifit ,does not, recheck the pintle installation. Motor Rotor Assembly-Installation 106 Install the motorrotor assembly on the pintle.
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Body Assembly-Reassembly Body/Cover-Reassembly Note: Transmissions with sealed bearings incorporate an oil seal under the output bearing. 111 Install body. Align the output shaft with the bearing 1ocated: in pintle and shaft cross pin with the slot in the motor rotor assembly. Install two5/16” x 11/4” socket head cap screws Torque to 15 foot pounds. “Retaining Ring Important: Be sure the output shaft rotates freely by hand. If it does not, recheck body installation.
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Trouble Shooting Instructions This fault-logic troubleshooting section is designed as a diagnostic aid in locating transmission problems. Match the transmission problem with the problem, statements and follow the action steps shown in the diagrams. This will give the user expedient aids in correcting the problem and eliminating unnecessary machine down time.
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LOSSof Power or System Will Not Operate in Either Direction External Clogged Defective Replace Defective Defective or Replace Serviceable Externally I System Operating Hot Transmission Cooling Fins Clogged Defective Replace 23
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EATON HYDROSTATICTRANSMISSION MODEL 11 "REPAIR MANUAL NO. 7-402 I . Fluid Recommendations'A reputable supplier can help you makethe best selection of hydraulic fluid for use in Eaton light duty hydrostatic transmissions. For satisfactory operation, the following fluid conditions apply: I 1. Accurate level readings can be checked only when the fluidis cold. 2. If the natural color of the fluid has become black or milky, it is possible that an overheating or water contaminant problem exists. 3.