13Instruction Manual
4.6 ROUTINE PREVENTIVE MAINTENANCE
BEFORE ANY MAINTENANCE,
RELIEVE ALL PRESSURE FROM
SYSTEM, ISOLATE LIQUID END FROM ALL SOURCES OF
PROCESS LIQUID WITH APPROPRIATE VALVING, AND PURGE
LIQUID END OF ALL PROCESS LIQUID.
All inquiries on part order should be addressed to
your local Milton Roy sales representative or sent
to: www.miltonroy.com.
4.7 HYDRAULIC OIL REPLACEMENT
Inspect and replace hydraulic oil on the same
schedule as the pump’s gear drive lubricant
(see the appropriate pump drive instruction manual
for this information). Semiannual replacement is
recommended, and can be scheduled to coincide
with season oil changes.
To replace the hydraulic oil:
1. Remove the catchall cover by unscrewing the
four screws, which hold it on.
2. Place a container under the pump catchall to
catch the oil and unscrew the catchall drain
plug.
3. When oil has finished draining, make sure
that the area around the drain hole is clean.
Screw drain plug back in securely.
4. Fill the catchall to the top of the oil seal that
surrounds the crosshead with new, clean oil.
Use hydraulic oil or any good quality type A
automobile transmission uid.
5. Replace the catchall cover the screw rmly in
place.
NOTE:
It is not necessary to purge the liquid end
displacement chamber of oil during annual oil
replacement.
6. Dispose of oil according to federal, state, or local
codes that may apply.
4.8 CHECK VALVE MAINTENANCE
4.8.1 Disassembly
BEFORE PERFORMING ANY
MAINTENANCE ON THE CHECK
VALVES, RELIVE ALL PRESSURE FROM SYSTEM, ISOLATE
LIQUID END FROM ALL SOURCES OF PROCESS LIQUID WITH
APPROPRIATE VALVING, AND PURGE LIQUID END OF ALL
PROCESS FLUID.
After insuring that all system pressure has been
relieved and that all hazardous process liquids
have been ushed from the liquid end, disconnect
both the suction inlet and discharge outlet from the
system piping.
1. Loosen the retaining nut, then remove.
Once disassembled, the O-rings should be
discarded.
2. Check valves may be removed. A compressed
O-ring provides the seal to the head.
Inspect the balls carefully. If they are smooth,
round and free of deposits or pits, then they
are suitable for continued use. Examine the
check valve seats. The area of the seat where
it meets the ball (the un-chamfered side) must
be in near perfect condition for continued use.
Any imperfection visible on the seating surface
(pits, erosion, cracks, or a ball shaped contour
greater than 0.030 deep) makes the seat
unusable. If both the balls and seats are in good
condition, then the length of time between parts
replacement may be lengthened. If the balls and
seats are severely damaged, then the length
of time between parts replacement should be
shortened.
4.8.2 Re-assembly
1. Replace O-ring on the check valves.
Lubricate the O-rings and check valve threads
before assembly.
2. Attach port adapter and tighten retaining nut.
SECTION 4 - MAINTENANCE
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