Service Manual

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EATON 6, 7 HYDROSTATIC TRANSMISSION

Table of Contents – Page 1 of 1

GENERAL PARTS LIST MODEL 6 AND 7

PRODUCT IDENTIFICATION AND ORDERING INFORMATION

SPECIAL TOOLS TO AID IN DISASSEMBLY/REASSEMBLY

DISASSEMBLY/REASSEMBLY

RESERVOIR/ADAPTER—DISASSEMBLY

BODY/COVER--DISASSEMBLY

COVER--DISASSEMBLY

CAM RING--DISASSEMBLY/INSPECTION

PUMP ROTOR--REMOVAL

PINTLE ASSY.-- REMOVAL

PINTLE ASSEMBLY--DISASSEMBLY/INSPECTION

CHECK VALVE--REMOVAL

CHECK VALVE--INSTALLATION

DAMPENING PISTON--REMOVAL (MODEL 7 ONLY)

DAMPENING PISTON--INSTALLATION

MOTOR ROTOR--REMOVAL

ROTOR ASSEMBLIES--DISASSEMBLY INSPECTION

BODY--DISASSEMBLY

COVER--REASSEMBLY

CAM RING---INSTALLATION

PUMP ROTOR-INSTALLATION

PINTLE--INSTALLATION

BODY--REASSEMBLY

MOTOR ROTOR--INSTALLATION

COVER/BODY--REASSEMBLY

RESERVOIR/ADAPTER--REASSEMBLY

START-UP PROCEDURE

TROUBLE SHOOTING INSTRUCTIONS

HYDROSTATIC FLUID RECOMMENDATIONS

Summary of content (17 pages)

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EATON 6, 7 HYDROSTATIC TRANSMISSION Table of Contents – Page 1 of 1 GENERAL PARTS LIST MODEL 6 AND 7 PRODUCT IDENTIFICATION AND ORDERING INFORMATION SPECIAL TOOLS TO AID IN DISASSEMBLY/REASSEMBLY DISASSEMBLY/REASSEMBLY RESERVOIR/ADAPTER—DISASSEMBLY BODY/COVER--DISASSEMBLY COVER--DISASSEMBLY CAM RING--DISASSEMBLY/INSPECTION PUMP ROTOR--REMOVAL PINTLE ASSY.
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NO. 7-403 \'r Eaton Hydraulics Division / Eaton Hydrostatic Transmissions - Model 6 7
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General Parts List Model 6 and 7 Item No. Description 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 29 Reservoir Adapter Reservoir Cover Subassembly Reservoir Body Reservoir Adapter Seal Ring Cover Service Kit Dowel Pin Retaining Ring Washer Button (Model 7 only) Guide Fitting Subassembly O-Ring Dump Valve Bracket Spring Seal Ring Pump Rotor and Ball Assembly Pump Race Cam Ring Assembly (includes No.
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Contents Product Identification and Ordering Information ProductIdentificationand Ordering Information Exploded View Part Description Disassembly-Reassembly 4 2 3 Procedures Body Assembly-Disassembly Reassembly 9 11 Body/Cover-Disassembly Reassembly 5 11 Cam Ring-Disassembly/lnspection Installation Refer to specific listing covering your Eaton transmission. Parts listings are available from the Hydraulics Division, Minneapolis Plant.
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Disassembly/Reassembly Reservoir/Adapter-Disassembly Eaton light duty transmissions are equipped with one of two adapters or a reservoir as shown in Fig. 2. 1 Remove the adapter or reservoir by rotating clockwise. Important: The adapters and reservoir have left hand threads. To remove turn clockwise. To remove adapter #1 use a six point 1½”1/2” hex wrench or socket. To remove adapter #2 use a six point 1” hex wrench or socket. To remove the reservoir use a small filter or web wrench.
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Important: Do not allowthe cam ring, pintle, or lift with the cover. The pump rotor assembly to pump ball piston assembly must remain intact as the pistons ball are matched to the pump rotor bores. 9 Removethebuttonfromthecover(model 7 only). Whereapplicable,removethedumpvalveguide,nut, O-ring. and Discard O-ring. the Cove Ifthe cover does not separate easily from the body because of fluid seal, tap the body and or cover with plastic hammer to break the seal.
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Pintle Assembly-Disassembly/lnspection Pump Race Fig. 9 Note: The pump race is press fit in the cam ring and will require a press to remove it. The cam ring and pump race are available as an assembly. Note: If irregularities are noted in the pump race, itis reasonable to assume that one or more ball pistons and rotor bores will also be damaged. Pump Rotor-Removal Pintle Fig. 12 15 We do not recommend complete disassembly of the pintle assembly for cleaning. Normal flushing should be all that is required.
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17 Press or drive out the coil pin that retains thetwo check valve bodies. Use a four blade5/16-18 tap to tap holes in check valve bodies. Insert a long bolt or a threaded puller, pull the check valve bodies from the pintle housing and discard them. 18 Remove check balls and retaining ring. 19 Inspect check valve balls and retaining rings. Replace any defective parts. Check Valve-Installation 20 Install retaining rings and check valve ballsin bores of pintle. Press new check valve bodies in bores.
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Spring Motor Rotor 31 Remove the snap ring that retains the output shaft and tap or press the shaft from the body. Body Pump Rotor Seal Bearing Fig. 17 27 Inspect the rotor assemblies. Remove the piston balls from the rotor, one at a time, by working clockwise from the letter stampedin the face of the rotor and placing in a prepared container. Note: Each ball replaced be must Fig. in same bore the from which it was removed.
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measured Cover Fig. 24 Fig. 21 40 Lubricate I.D. of new oil seal with clean lubricant. Then press or tap sealin bore until completely seated. Washer Oil Seal Cover Fig. 25 Lip Seal Fig. 22 37 Press loose or broken dowel pin out. Remove Cover retaining ring and washer from end of control shaft. Remove control shaft outward from the cover. . .. .. . . .. .. . . . . . . ... .. Fig. 26 41 Lubricate inner surface of the lip seal with a clean lubricant.
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42 Install the input shaft assembly into bottom position in the counter bore in cover. Install the retaining ring in the groove located in front cover. Pump Rotor-Installation Pump Rotor Cam Ring-Installation Rubber Band Cam Ring Cam Ring Insert Cover Fig. 30 47 Align the internal spline in the pump rotor assembly with the external spline on the input shaft and install the pump rotor in the cover. Remove rubber the band retaining pistons ball (if the used). Fig.
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Note: Do not force pintle through the pump rotor assembly as it is a slip fit. The pump rotor assembly must turn freely on the pintle by hand. If not recheck pintle installation. Retaining 50 Push dump valve shaft in and thread into dump valve bracket. Torque to 2-3Foot Pounds. 51 Lightly grease new cover sealing ring and install in the groove in the cover. Body-Reassembly Lip Seal Fig.
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Cover/Body-Reassembly 61 Lightly grease sealing ring and install into recess in cover. 62 Install the adapter or reservoirin cover by rotating counterclockwise. Torque to Approximately 8-12 ft. Ibs. Important: The adapters and reservoir are threaded left hand. To install, turn counterclockwise. Start-up Procedure Fig. 36 i Important: Be sure to realign previous scribed line for correct ouput rotation. If body assembly is installed 180°as previous assembled output rotation will be reversed.
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Trouble Shooting Instructions This fault-logic troubleshooting section is designed as a diagnostic aid in locating transmission problems by the user. 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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System Operating Hot f-' Transmission Oil Check I Below Level I Proper Level OK Clogged Defective I Clean Serviceable Externally Loss of Power or System Will Not Operate in Either Direction OK Below Level Defective 15 Defective
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EATON HYDROSTATIC TRANSMISSION MODEL 6 / 7 REPAIR MANUAL NO. 7-403 Hydrostatic Fluid Recommendations A reputable supplier can help you make the best selection of hydraulic fluid for use in Eaton hydrostatic products. F o r satisfactory operation, the following recommendations apply: 1. The filter systemused in the hydraulic circuit should be to capable of cleaning and maintaining the hydraulic fluid meet ISOCleanliness Code 18/13 per SAE J1165.