Service Manual
Reassembly
Hydraulic Motor type MM, MLHM
- 5 -
To ensure correct assembling orient motor
parts according to previously drawn marking
line.
1. Lubricate output shaft with hydraulic oil.
2. Lubricate lightly all internal housing
surfaces with hydraulic oil. Mount shaft in
housing.
3. Place the motor in reassembly device with
output shaft up.
4. Install needle bearing, then thrust washer
on the shaft.
Place front cap on clean soft surface.
Lubricate shaft seal and dust seal with light film
of clean petroleum jelly (Shell Retinax Grease
HDX2).
5. Place shaft seal in the front cap and firmly
push with Seal driver (see Fig.7).
Fig. 7
6. Turn on the front cap to 180
o
. Carefully
press dust seal into place. Lips of shaft seal and
dust seal must face outward. Lubricate the O-
ring and fit it to the front cap.
Important: Check seal condition after
installing in housing. If damaged, cut or
improperly installed, replace with new ones.
7. Install the front cap incl. assembled seals
on the shaft. Prevent the seals against damages.
8. Install in the front cap 6 screws M6x16 with
washers and alternately torque them to 8÷10 Nm
(see Fig.5).
9. Reposition motor in reassembly devise with
shaft down.
10. Install cardan shaft into splines of output
shaft.
11. Lubricate and install O-ring in the groove
of the distributor plate (see Fig.3). Install the plate
with O-ring side to the housing.
Timing Procedure
Fig. 8
12. Lubricate O-rings (2 pcs.) and place them
in seal grooves of both stator sides.
13. Place gerotor set on distributor plate
aligning any star point with the shaft key groove
(tooth of external spline) (see Fig.8).
Reverse Rotation: Reverse rotation is obtained
by aligning any star valley with the shaft key
groove (tooth of external spline)
14. Stave 2 chamfers by the side of groove for
O-ring 54,5x1,5 using a hammer, stamp and 5
CW
CCW
B
A
B
A
Shaft
Seal
Dust Seal
Front Cap
O-Ring
Seal
Driver
Press
Star
Point
Cardan
Shaft
Gerotor
Set
Output
Shaft
Star
Valley
Key
groove
(tooth of spline)
