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Section 230-0040
SM 1950 4-00
3
Body System - Hydraulic Tank
Replacing Hydraulic Oil
The hydraulic tank should be drained, cleaned and
hydraulic oil changed every 2 000 hours. Refer to
Section 300-0020, LUBRICATION SYSTEM, for
hydraulic oil used in the system.
Replacing Filter Element
Clean filter housing and install new filter element (13)
when hydraulic oil filter warning light illuminates, or
after every 2 000 hours of operation, whichever comes
first.
Note: When hydraulic oil in tank assembly (1) is being
replaced due to a hydraulic failure, or at recommended
change interval, filter element (13) should be replaced.
1. Position the vehicle in a level work area, be sure the
body is completely lowered, apply the parking brake
and switch off the engine.
2. Block all road wheels and place the battery master
switch in the 'Off' position.
3. Lift window guard from tank (1) to allow access to
access cover (7).
4. Remove bolts (3) and lockwashers (4) securing
access cover (7) to tank (1). Remove and discard
gasket (6) from tank (1).
5. Remove cap from anti-spill drain plug (39), install
drain tube connection and drain hydraulic oil, to below
the level of filter element (13), into a suitable container.
Remove drain tube connection and reinstall cap.
6. Remove wing nuts (9) from rods (10). Slide relief
valve (11), adaptor plate (12), filter element (13) and
gasket (14) over rods (10) and remove from tank assembly
(1). Discard filter element (13) and gasket (14).
WARNING
Splashing liquid. Wear a suitable face shield
when using compressed air to dry hydraulic
tank and components.
7. Clean out filter element (13) compartment in tank
assembly (1) with a suitable solvent and dry with
compressed air.
2.75 bar (40 lbf/in²) restriction, indicating filter element
(13) requires to be changed.
Temperature switch (28), installed in access cover (7),
opens when a temperature of 50° C (122° F) is
reached. Temperature switch (28) is connected in
series with pressure switch (26), therefore, hydraulic
oil filter warning light on the dash will not illuminate
until the hydraulic oil temperature rises above 50° C
(122° F).
Relief valve (11) in filter element (13) will open when a
pressure of 3.5 bar (50 lbf/in²) is reached within the
filter compartment of the hydraulic tank.
Installed in access cover (8) is a breather which allows
any air entering tank assembly (1) to escape to
atmosphere, preventing air pressure build up within
tank assembly (1).
MAINTENANCE
Numbers in parentheses refer to Fig. 1.
Note: Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of sufficient capacity to do the job
safely.
Checking Oil Level
1. Operate the body hoist and steering systems
several times to bring the oil to correct operating
temperature.
2. Position the vehicle in a level work area, be sure the
body is completely lowered, apply the parking brake
and switch off the engine.
3. Check oil level and add oil if low. The bottom sight
gauge (21) should show full. If oil is required, remove
filler cap (2) and fill tank assembly (1) with hydraulic oil
as specified in Section 300-0020, LUBRICATION
SYSTEM. Install filler cap (2) on filler neck assembly
(5).
Summary of Contents for TA30
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