33Installation, Operations & Maintenance Manual
5. Remove control spool (160) from bore.
6. For mRoy A pumps, fabricate a tool by inserting
a 3/16” diameter x 4-in. long soft plastic
(e.g. Nylon) solid rod into the 3/16” hole and
shaping the end with a 7/16” reamer inserted
into the control spool bore. For the mRoy B
pumps, a tool is not required.
CAREFUL USE OF REAMER IS
HIGHLY RECOMMENDED AS
DAMAGE MAY OCCUR TO THE SURFACE OF THE BORE. A
TOOL, PART NUMBER O-RING TOOL CAN BE PURCHASED
FROM MILTON ROY.
Reassembly
1. Place new O-rings (150) on control spool (160)
and coat O-rings liberally with grease to hold
them in place.
2. Place O-ring tool (notch facing up to guide
O-ring across intersecting passage), into 3/16
hole at 12:00 o’clock position behind the contour
plate.
3. Push control spool and O-rings into bore
carefully, using a O-ring tool to guide O-ring
across intersecting passage. This is done
to prevent damage to O-rings. Finally, guide
control piston into center of control spool, motor
side.
4.9.6 Worm Gear Replacement (Figure 17)
Disassembly
1. Remove motor assembly, following instructions
shown in “Motor and Worm Replacement”
section.
2. Remove two screws (250), linkage arm (240),
and control plunger (230).
3. Use arbor press or hammer and brass punch to
remove the gear shaft from the gear.
4. Lift worm gear, connecting rod, and plunger
assembly up and out of pump housing.
Reassembly
1. Once the gear along with plunger and connecting
rod assembly is in the housing you are ready to
slide the gear shaft back into the housing.
2. When installing gear shaft into the pump
housing you will need to Loctite the ends of
the shaft to prevent oil leaking.
3. Make sure sealing grooves are clean. by
wiping down with isopropanol 70/30 alcohol
and allowing it to evaporate for 10 sec.
4. Loctite primer must be applied completely
around the gear shaft O.D. and the pump
housing I.D for the gear shaft.
5. Make sure sealing grooves are clean. by
wiping down with isopropanol 70/30 alcohol
and allowing it to evaporate for 10 sec.
6. While the shaft is hanging out of the hole,
apply Loctite 242 to the O.D. of the exposed
shaft of side A and on the other side of the
housing apply Loctite to the I.D. of the pump
housing gearshaft hole on side B. Then push
the shaft thru exposing side B shaft, then you
can repeat the Loctite step on side B.
7. Make sure the shaft is ush or below
ush on both sides of the housing.
8. Note: Loctite has a 45 minute working
time and 24 hours for a full cure. Wipe off
any excess Loctite.
9. Complete Reassembly by reversing steps
1 & 2.
4.9.7 Connecting Rod and Plunger
Replacement (Figure 17)
Disassembly
1. Lift connecting rod (100) up and back to
disengage plunger (90) from bore.
2. Use arbor press or hammer and brass punch
to remove wrist pin (110) from connecting rod
(100) and plunger (90).
3. To assure proper installation, note position of oil
groove for wrist pin (110) and oil groove for worm
gear (120) with respect to connecting rod (100)
and plunger (90). Groove should be located at
bottom of bore.
SECTION 4 - MAINTENANCE
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