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TM10-3930-660-20
18-3. HYDRAULIC SYSTEM - SERVICE
This task covers:
a. Purging air from piston pump.
b. Purging air from tandem gear pump.
Initial Setup
Tools
Materials/Parts
Tool Kit, Automotive Mechanics
Container, 1 Gal.
Hydraulic Oil (App. C, Item 36)
Cap and Plug Set
Tags (App. C, Item 51)
Equipment Condition
Personnel Required
Vehicle parked on level ground.
Two personnel
Transmission cover removed, para.
16-6.
Reference
Wheels chocked.
TM10-3930-660-10
Hydraulic 0il in the system can be under
pressures over 3000 psi with the engine
OFF. ALWAYS relieve pressure in
hydraulic lines before attempting to
remove any component in the hydraulic
system. With engine OFF, starter
switch in RUN position, and MLRS
attachment on the ground, move control
levers through all operating positions
several times to relieve line pressure.
Relieve pressure in hydraulic oil tank
by loosening filler cap very slowly.
Failure to follow these precautions
could result in serious personal injury.
At operating temperatures, hydraulic oil
is hot and under pressure. Hot oil can
cause injuries. Allow hydraulic oil to
cool before disconnecting any hydraulic
lines.
CAUTION
Wipe the area clean around all hydraulic
connections to be opened during removal
and disassembly. Cap oil lines and plug
holes after removing lines.
Contamination of the hydraulic system
could result in premature failure.
If more than one hydraulic line is to be
removed, identify lines to assure proper
installation.
Use suitable container to
catch any hydraulic oil that may drain
from system.
Remove caps and plugs as hoses are
installed.
Wipe all sealing surfaces on
hydraulic components and hoses clean and
dry.
Apply film of clean hydraulic oil
to all seals, if present,
as they are
installed.
Purging air from the piston pump or
tandem gear pump is normally necessary
only under the following conditions:
When hoses between pumps and the
hydraulic reservoir are disconnected.
When the hydraulic reservoir is
drained and refilled.
When it is suspected that air in pump
cavities is causing hydraulic system
malfunction.
18-2
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