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TM 10-3930-660-24-1
PISTON PUMP REPLACEMENT
THIS WORK PACKAGE COVERS
Removal, Installation
INITIAL SETUP
Tools and Special Tools
References
Tool kit, general mechanic's (Item 39, WP 0324 00)
Shop equipment, common no. 1 (Item 20, WP 0324
Personnel Required
Two
Materials/Parts
Equipment Condition
Cap and plug set (Item 8, WP 0323 00)
Oil, lubricating (Item 32, WP 0323 00)
Vehicle parked on level ground (TM 10-3930-660-
10)
Tag, marker (Item 57, WP 0323 00)
Boom raised (TM 10-3930-660-10)
Lockwasher (19)
Transmission cover removed (WP 0150 00)
O-ring (21)
REMOVAL
WARNING
When working under the boom, always use blocks or other supports. Combined weight of boom and
MLRS attachment is approximately 6,300 lb (2858 kg). Failure to adequately support the boom could
result in severe injury or death.
Do NOT remove hydraulic tank filler cap or disconnect or remove any hydraulic system line or fitting
unless hydraulic system pressure has been relieved. Hydraulic system pressure can be over 3,000 psi
(20685 kPa), even with engine and pump OFF. To relieve pressure, lower all hydraulic attachments to
the ground and shut down engine. Move control levers through all operating positions, then SLOWLY
loosen hydraulic tank filler cap. After maintenance, tighten all connections before applying pressure.
Escaping hydraulic fluid under pressure can penetrate the skin, causing injury or death.
At operating temperature hydraulic oil is hot. Allow hydraulic oil to cool before disconnecting any
hydraulics. Failure to do so could result in injury.
CAUTION
Wipe the area clean around all hydraulic connections to be opened during removal and disassembly. Con-
tamination of the hydraulic system could result in premature failure.
NOTE
If more than one hydraulic line is to be removed, tag lines to ensure proper installation. Use suitable con-
tainer to catch any hydraulic oil that may drain from system.

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