HYDRAULIC MOTOR Figure 3-5)
Disassembly. Prior to removing roller strator motor from unit, clean off all dirt, disconnect hydraulic
connections and plug ports. Remove motor from unit. After removal, clean the motor with solvent to remove all excess
dirt from outside of the motor. Remove the key from shaft (11). Place the motor in a vise, shaft down, taking care to
clamp at port area of housing. Place newspaper or a sheet of cardboard on top of work bench to obtain a clean work
Remove seven bolts (19) (9/16 socket or boxed end).
Lift end cover (18), pressure plate (17), rotor assembly (10), manifold boot (22), and manifold plate (14),
from housing assembly. Take care to note top and bottom of pressure plate, rotor assembly, manifold
boot, and manifold plate.
Remove pins (16), drivelink (12) and thrust bearing (10).
Remove shaft (11) from housing (5) by pushing coupling end of shaft into and through housing with
palm of one hand while lifting shaft with the other hand. At no time should shaft be struck directly with a
Remove dust seal (1) from housing by prying with a screw driver.
Push down the seal carrier (6) and thrust bearing (10) with thumbs past the housing bore seal to
facilitate seal and retainer removal. With a small screw driver, dislodge and remove retaining ring (2).
Remove steel shim back up (3) and seal (4) with a small screw driver.
Lift out seal carrier (6) and thrust bearing (10).
Assembly. Before assembling, wash all parts off in clean solvent. It is advisable to obtain a new seal kit
containing items 1, 2, 3, 4, 7, 8, 9, 13 (4 seals) and 21. All seals should be lightly lubricated prior to assembly.
Place housing in vise with mounting flange end up.
Assemble spacer ring (7) into seal carrier (6) making sure tang is engaged in slot provided in seal
carrier. Next install steel shim backing ring (8), then shaft seal (9) with lip side away from steel backup
(8). Again, check tang engagement. Work spring (21) into carrier (6) and around seal lip.
Place thrust bearing (10) on shaft (11) followed by the seal carrier assembly (6, 7, 8, 9, and 21) with
large diameter of seal carrier toward thrust bearing.
Slide shaft assembly (6, 7, 8, 9, 21, 10, 11) into housing assembly. (Inserting large diameter of shaft
into mounting flange end of housing and pushing through.) Push shaft assembly into housing so that
seal carrier is beyond housing bore seal groove in order to facilitate seal and retainer installation.
Install seal (4) into housing groove.