Motor Assembly - Stanley CO25 Service Manual

Check for cracks between the drive gear keyway and gear
tooth root. Replace the gear if one or more cracks are pres-
ent.
SHAFTS
The surface of the motor shaft where the bearing and seal
are mounted must be smooth.
Grooves, roughness or a reduced diameter indicate fl uid
contamination or damaged bushings. Abrasive particles
can become imbedded in the bushings and grind into the
hardened shaft.
If this abnormal shaft wear occurs (in excess of normal
polishing) both the shaft and associated bushings must be
replaced.
Check the hydraulic system fi lter and hydraulic fl uid for
contamination. Operating conditions may required changing
from a 25-micron fi lter to an oversize 10-micron fi lter.
ASSEMBLY
Always replace any seals or O-rings that are disturbed dur-
ing disassembly of a part. When installing the new seals,
lubricate them and make sure they seat all the way around
the groove in the part. All the required seals are in the seal
kit.
Refer to the parts illustration in this manual for the location
of parts.

MOTOR ASSEMBLY

1. Install the seal gland in the motor-shaft bore in the bear-
ing housing.
2. Lubricate and install the quad ring in the inside groove in
the seal gland.
3. Lubricate and install a new O-ring on the outside of the
seal gland.
4. Carefully insert the narrow end of the seal gland in the
bearing housing (in the wheel guard end of the motor-shaft
bore).
5. Install the retaining ring to hold the seal gland in place.
6. Install a new bearing on the motor shaft if the old bearing
was removed during disassembly.
SERVICE
7. Support the new bearing's inner race and press the
threaded end of the motor shaft through the center of the
bearing until it bottoms out on the shaft's fl ange.
8. Install the motor shaft and bearing in the bearing hous-
ing. Place the bearing housing on a smooth clean arbor
press surface (protected from damage), with the large bear-
ing bore facing up. Position the piece so that a clearance hole
exists for the insertion of the motor shaft.
9. Apply heavy grease to the motor shaft and bushing and
fi ll the keyway on the shaft.
10. Insert the motor shaft through the seal gland in the mo-
tor shaft bore.
11. Use a sleeve or socket with a diameter equal to the
bearing OD (or shaft pusher P/N 00850) to press the bear-
ing assembly into place.
Note:
Press only on the bearing outer race.
12. Install the bearing retaining ring to secure the motor
shaft assembly in place and then install the drive gear on
the motor shaft.
13. Install the needle roller in the keyway in the motor shaft.
Use a small amount of grease to keep it in place.
14. Slide the drive gear onto the shaft over the needle
roller.
15. Install the idler shaft and gear by inserting the idler
shaft in the second bore in the bearing housing. Slide the
idler onto the idler shaft.
16. Apply grease to the face seal O-ring groove. Install the
O-ring in the groove.
17. Install the gear housing on the bearing housing.
Do not force the housings together.
Note:
If they do not go together easily, they are not properly
aligned or one or more parts are not correctly installed.
18. Make sure the two alignment dowel pins are in the
opposite holes in the face of the bearing housing. Care-
fully align the dowel and bolt holes in the bearing and gear
housings. The hole pattern is designed so the housings can
be joined only one way.
23
IMPORTANT