Stanley SK58 Service Manual page 13

bushing bores are yellow-bronze, replace them and
investigate the cause of wear.
The flat surfaces around the chamber and bolt holes
should be flat and free of nicks or burrs that could cause
misalignment or leaks.
Bushings
The inside of the bushings should be gray with
some bronze showing through. If significant yellow-
bronze shows, replace the bushings. Inspect the drive
hex and idler gear for corresponding wear and replace as
required.
Gears
The drive and idler gears should have straight tips
without nicks; square tooth ends and a smooth even
polish on the teeth and end faces. Check for cracks
between the drive gear keyway and gear tooth root.
Replace the gear if cracks are present.
Motor Plate
The surface near the gears should show two intercon-
necting polished circles without a step.
Drive Hex and Idler Gear Shaft
The surface diameter at the bushing and seal locations
must be smooth. Grooves, roughness or a reduced
diameter indicate fluid contamination or damaged
bushings. If abnormal wear as above occurs (more than
normal polishing), replace the drive hex, idler gear and
associated bushings.
Also check the hydraulic system for excess contamina-
tion in the fluid and for filter condition.
MOTOR RE-ASSEMBLY
1. If new bushings were installed (see paragraph 9
under "HYDRAULIC MOTOR SERVICE", ensure each
bushing is flush with the surface of the part the bushing
is installed into. If the bushing sits higher than the
surface of the part, it will cause binding of related
components.
2. Apply grease and install a new back-up ring (81)
and a new quad ring (80) into the motor plate (68)
and into the drive motor control block (82).
3. Lubricate the drive hex (76) with clean hydraulic
fluid and install it into the drive motor chamber
(75).
11
4. Install the woodruff key (77) into the slot in the
drive hex.
5. Lubricate the idler gear (72) and drive gear (99)
with clean hydraulic fluid and then install them into
the drive motor chamber.
6. Apply grease and install a new o-ring (73) into the
groove in the drive motor chamber.
7. Install the motor plate to the drive motor chamber
and secure with 2 capscrews (67). Check that the
drive hex rotates freely.
8. Install the thrust washer (98) and thrust back-up
washer (97) over the drive hex and against the drive
motor chamber.
9. Install a new gasket (79) onto the drive motor
chamber.
10. Install the drive motor control block to the drive
motor chamber and secure with 3 capscrews (95).
Check that the drive hex rotates freely.
11. Apply grease and install a new cup seal (93) into the
drive motor control block, lips facing down. Install
the seal washer (92) on top of the cup seal. Apply
grease and install a new rod seal (91) on top of the
washer, lips facing up.
12. Apply grease and install a new o-ring (90) into the
groove on the drive motor control block.
13. Apply grease and install a new o-ring (84) into the
groove in the motor control valve (89). Install new
nylon cap locks (83) to the motor control valve.
Install the knob (86) and tighten the set screw.
Thread the motor control valve into the drive motor
control block. Loosen the set screw and remove the
knob.
14. Apply grease and install a new o-ring (85) onto the
valve guide (88). Place the valve guide over the
motor control valve and thread it into the drive
motor control block. Tighten it securely. Re-install
the knob and tighten the setscrew.
15. Install the motor over the side rods and into the flow
sleeve tube ensuring the roll pin is correctly aligned
with the hole in the flow sleeve (31) and the motor
control valve is oriented correctly with the handles.
16. Install the 4 side rod nuts. Tighten in 20 ft lb/25 Nm
increments to 75 ft lb/100 Nm in a cross pattern.