Char-Lynn ® No. 7-144 March, 1996 General Purpose Hydraulic Motors Repair Information J Series Geroler® Motor 001 002 General Purpose Motors J Series Geroler Motors Drive Shaft Spacer Bearing Housing Pressure Seal Thrust Washer Thrust Bearing Spool Drive Output Shaft Exclusion Seal Cap Screw (5) Valve Housing Spool O-ring Seal Geroler O-ring Seal Spacer Plate O-ring Seal Required Tools • 1/8 in. hex key • 3/16 in. hex key • 5 mm hex key (for motors with metric ports) • Torque wrench - 17 Nm [150 lb-in.] capacity 2 Plug/O-ring General Purpose Motors J Series Geroler Motors 1 Cleanliness is extremely important when repairing hydraulic motors. Work in a clean area. Before disconnecting the hydraulic lines, clean the port area of the motor. Before disassembly, drain the oil from the motor. Then plug the ports and thoroughly clean the exterior of the motor. Check the output shaft, remove any burrs, nicks, or sharp edges. 2 Make a scribe mark across the motor sections. This will help get the correct alignment when the motor is reassembled. 3 Remove the five cap screws and disassemble the motor as shown in the parts drawing. Note: Do not remove the retaining rings and check balls from the spool. 4 Carefully remove the exclusion seal and pressure seal from the bearing housing. A seal removal tool may be fabricated by bending and rounding the end of a small blade screwdriver, see figure 1. Important: During reassembly lubricate the new seals with a petroleum jelly like Vaseline. Also lubricate machined surfaces and bearings with clean hydraulic fluid. 6 Put the thrust bearing and thrust washer on the output shaft. 7 Apply a light coating of hydraulic fluid to the outside diameter of the pressure seal and carefully slide it onto the shaft so that it is next to the thrust washer. See figure 1 for the correct seal orientation. Note: The pressure seal is slightly thicker than the exclusion seal. 8 Slide the shaft into the bearing housing and press the pressure seal into its seat. 9 Remove the shaft, and thrust bearing and washer. 10 Using a 1 inch diameter dowel, press the pressure seal all the way into its seat. Be careful, do not damage the seal. Important: Do not damage the bearing housing. 11 Install the exclusion seal. Be sure to press it all the way into the seat. See figure 1 for the correct seal orientation. Pressure Seal 12 Apply a coating of Mobilith SCH 220, or equivalent to inner edges of the shaft seals. Bearing Housing Seal Removal Tool Exclusion Seal Figure 1 5 Check all mating surfaces. Replace any parts with scratches or burrs that could cause leakage. Wash all metal parts in clean solvent. Blow them dry with pressurized air. Do not wipe parts dry with paper towels or cloth. Lint in a hydraulic system will cause damage. Check the key way and chamfered area of the output shaft; remove any nicks, burrs, or sharp edges that could damage the shaft seals during reassembly. 13 Install the thrust bearing and washer onto the output shaft. Dip the bearing end of the output shaft, thrust bearing and washer in clean hydraulic fluid. Then carefully slide the output shaft into the bearing housing. Important: Do not damage the shaft seals, use of a protective bullet is recommended. 14 Install the shaft spacer, spool drive, and drive. The end of the drive with the small opening goes into the output shaft. 15 Lightly lubricate and install an o-ring seal in the groove in the bearing housing. 16 Install the spacer plate and align the screw holes. 17 Lightly lubricate and install an o-ring seal in the groove in the Geroler. Note: Always use new seals when reassembling hydraulic motors. Refer to Parts List 6-147 for seal kit part numbers, replacement parts, and ordering information. 3 General Purpose Motors J Series Geroler Motors 18 Install the Geroler and time the motor. – Align the corners of the spool drive end with the star points for standard timing, see figure 2. – Align the corners of the spool drive end with the star valleys for reverse timing, see figure 2. Standard Timing 19 Align the screw holes in the geroler with the screw holes in the bearing housing and spacer plate. Star Point Spool Drive 20 Lubricate the spool and slide it into the valve housing. Note: The spool is match fit to the valve housing, replace them as a subassembly. Reverse Timing Star Valley 21 Lubricate and install an o-ring seal in the groove in the valve housing. 22 Carefully install the valve housing and spool. Engage the spool with the spool drive, then rotate the valve housing until the scribe marks on the bearing and valve housings align. Spool Figure 2 Drive 23 Install the five cap screws and pretorque them in a crisscross pattern to 9-10 Nm [80-90 lb-in.]. Final torque in a crisscross pattern to 14-15 Nm [120-130 lb-in]. 22 If no case drain is used, Install the plug in the valve housing. Use a new o-ring and tighten it to 7 Nm [60 lb-in.]. 23 If a 2 bolt mounting flange is used, install the flange and tighten the screws, in a criss-cross pattern, to 8 - 10 Nm [71 - 89 lb-in.]. How to Order Parts Each order must include the following information: 1 2 3 4 5 Product Number Date Code Part Name Part Number Quantity Date Code Char-Lynn ® 00 0 Product number Eaton Limited, Hydraulics Division Glenrothes, Scotland KY7-4NW Product Number Week of Year 01 Thru 52 Last Number of Year 129 0000 000 Product Line Identification Number Product Identification Number Engineering Change Code ACCREDITED BY THE DUTCH COUNCIL FOR CERTIFICATION Reg. No. 24 Eaton Corporation Hydraulics Division 15151 Hwy. 5 Eden Prairie, MN 55344 Telephone 612/937-9800 Fax 612/937-7130 Eaton Ltd. Hydraulics Division Glenrothes, Fife Scotland, KY7 4NW Telephone 01-592-771-771 Fax 01-592-773-184 http://www.eaton.com Form No. 7-144 Copyright Eaton Corporation, 1991, 1994 and 1996 All Rights Reserved Printed in USA Eaton GmbH Hydraulics Products Am Schimmersfeld 7 40880 Ratingen, Germany Telephone 02102-406-830 Fax 02102-406-800 ISO-9001 CERTIFICATED FIRM DET NORSKE VERITAS INDUSTRY BV, THE NETHERLANDS Quality System Certified Products in this catalog are manufactured in an ISO-9001-certified site.
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