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be flat and free of nicks or burrs that could cause misalign-
ment 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 motor shaft for corresponding wear and
replace as required.
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.
Shaft Housing Assembly
The surface near the gears should show two interconnecting
polished circles without a step. The bottom of the o-ring
groove should be smooth as should the rest of the flat
surface.
The bore for the shaft seal (inside of the seal gland) should
be smooth or oil leakage may occur. The bore in which the
seal liner fits should also be smooth.
Shake the shaft housing and the two seal check balls (not
shown) should rattle. Unless there are leaks at the Allen type
plugs which retain the check balls (not shown), or the check
balls have jammed because of fluid contaminants, it is not
necessary to remove the plugs or check balls. If these are
removed, be sure the check seats (the bottom of the holes
into which the balls are placed around the small oil holes)
are smooth. If not, the seat can usually be fixed by cleaning
and then placing the ball in the hole and tapping on the ball
with an aluminum or bronze rod.
Reassemble ball and plug with the inner end of the plug just
starting to show in the hole as viewed through the oil slot on
the gear face of the housing. You can also use a wire
through this hole to feel when the plug is deep enough. Note:
Use sealant/adhesive such as Loctite
threads.
Shafts
The shaft diameter at the bearing and seal loca-tions must
be smooth. Grooves, roughness or a reduced diameter
indicate fluid contamination or damaged bushings. Grit
particles may have been imbedded in the bushings, grinding
into the hard-ened shaft. If abnormal shaft wear as above
occurs (more than normal polishing), replace both the shaft
and associated bushings.
Also check the hydraulic system for excess con-tamination
SERVICE
tm
PST on plug to seal
16
in the fluid and for filter condition. Operating conditions may
require changing from a 25-micron filter to an oversized 10-
micron filter.
REASSEMBLY
1. Grease and carefully install the quad ring into the groove
on the inside of the seal gland. Care-fully install the o-ring
into the groove on the outside diameter of the seal gland and
install the seal gland into the bore of the shaft housing.
Replace the retaining ring.
2. To replace the bearing on the motor shaft, support the
bearing inner race and press the motor shaft through the
bearing inner race.
3. If the bushings were removed, install new bushings using
a p/n 11918 bearing pusher.
4. Apply grease to the motor shaft, keyway and bushing then
insert it through the shaft seal. Using a sleeve/socket with a
diameter equal to the bearing O.D., press the bearing
assembly into place. Press only on the outer race.
5. Install the needle roller in the keyway of the motor shaft.
Use grease to keep the roller in place. Slide the drive gear
over the roller and shaft. Install the idler shaft and gear.
6. Apply grease to the face seal o-ring groove; then install
the o-ring.
7. Note the screw hole pattern on both housings. They will
only assemble one way. With all parts aligned, carefully slide
the gear housing assembly over the gears until it contacts
the bearing housing assembly. Do not force parts together.
8. Turn the motor shaft manually to check for free rotation.
Install the eight capscrews and then recheck rotation.
VALVE HANDLE DISASSEMBLY
1. Remove the 2 capscrews (11) which fasten the valve body
(24) to the dipped tube (10).
2. Remove the valve body and related parts from the dipped
tube by wiggling the valve body and pulling at the same time.
3. Remove the oil tubes (9) from the valve body. If one or both
oil tubes remained in the dipped tube, remove the eight
capscrews (8) which fasten the dipped tube to the motor
assembly and then remove the dipped tube and the oil tubes.
4. Knock out the roll pin (20) which holds the valve spool (31)
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