Operation and maintenance manual

Section 230-0040
SM 1913 Rev 2 10-03
3
Body System - Hydraulic Tank
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate 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, ensure the
body is fully lowered, apply the parking brake and
switch off the engine. Turn steering wheel in both
directions several times to relieve any pressure in the
steering circuit. Operate treadle valve continuously to
discharge braking accumulators.
3. Block all road wheels, place the steering lock bar in
the 'Locked' position and the battery master switch in
the 'Off' position.
4. Check oil level and add if low. Sight gauge (11)
should show half full. If oil is required, remove
padlock (33) and filler cap (2) from hydraulic tank (1)
and fill hydraulic tank with hydraulic oil specified in
Section 300-0020, LUBRICATION SYSTEM. Install
filler cap (2) on hydraulic tank (1) and secure with
padlock (33).
Replacing Hydraulic Oil
Hydraulic oil should be changed every 2 000 hours.
Refer to Section 300-0020, LUBRICATION SYSTEM,
for hydraulic oil used in the system.
Note: When replacing the hydraulic oil due to a
hydraulic failure, or at recommended change interval,
element (32) must be replaced and hydraulic tank (1),
and strainer (12) cleaned thoroughly using a suitable
solvent.
Replacing Filter Element
After first 100 hours of operation or when visual
indicator (29) shows red, whichever comes first, clean
filter assembly (13) and install new element (32).
Every 1 000 hours of operation or when visual indicator
(29) shows red, whichever comes first, clean filter
assembly (13) and install new element (32).
1. Position the vehicle in a level work area, ensure the
body is fully lowered, apply the parking brake and
switch off the engine. Turn steering wheel in both
directions several times to relieve any pressure in
the steering circuit. Operate treadle valve
continuously to discharge braking accumulators.
2. Block all road wheels, place the steering lock bar in
the 'Locked' position and the battery master switch in
the 'Off' position.
3. Remove bolts (5) and washers (6) securing cover
plate (24) and access cover (10) to top of hydraulic
tank (1). Remove access cover (10) and gasket (7)
from hydraulic tank (1). Discard gasket (7).
4. Unscrew wing nuts (25) and remove filter
assembly (13) from hydraulic tank (1).
5. Remove and discard element (32) from filter
assembly (13).
6. Install new element (32) in filter assembly (13).
7. Install filter assembly (13) over rods (26) and
secure in place with wing nuts (25).
8. Secure cover plate (24), access cover (10) and
new gasket (7) on hydraulic tank (1) with bolts (5)
and lockwashers (6).
9. Remove padlock (33) and filler cap (2) from
hydraulic tank (1) and fill hydraulic tank with hydraulic
oil specified in Section 300-0020, LUBRICATION
SYSTEM. Install filler cap (2) on hydraulic tank (1) and
secure with padlock (33).
Cleaning/Replacing Strainer
Note: Strainer (12) should be cleaned every time
hydraulic tank (1) is drained for any reason. Refer to
'Replacing Hydraulic Oil' for change interval.
1. Position the vehicle in a level work area, ensure the
body is fully lowered, apply the parking brake and
switch off the engine. Turn steering wheel in both
directions several times to relieve any pressure in the
steering circuit. Operate treadle valve continuously to
discharge braking accumulators.
2. Block all road wheels, place the steering lock bar in
the 'Locked' position and the battery master switch in
the 'Off' position.