JLG 3248RS/10RS Service Manual - Manual (Page 84)

SECTION 4 - HYDRAULICS
4-4 – JLG Lift – 3121273
NOTE: Recommended lubricating intervals are based on
machine operations under normal conditions. For
machines used in multi-shift operations and/or
exposed to hostile environments or conditions,
lubrication frequencies must be increased accord-
ingly.
Pump/Tank Disassembly
(See Figure 4-2.)
1. Place the pump/motor assembly on a clean work-
bench.
NOTE: Drain the hydraulic oil by carefully removing the oil fill plug
located on the hydraulic reservoir and tilting the assembly up
allowing oil to drain into a clean container.
2. Remove the oil tank from the pump as follows:
a. Slowly loosen and remove the four bolts that
hold the tank to valve body attachment ring on
to the valve body.
b. Carefully remove the tank from the valve taking
care not to damage internal pickup tube or o-
ring gasket on tank.
c. Place tank on a suitable work bench or work
area.
NOTE: The filter and bypass are located on the pickup tube inside
the tank. The filter should be changed once a year.
3. If replacing filter, pull old filter off the end of the tube
and push new filter onto the end of tube.
a. Thoroughly clean the tank and clean any debris
from the magnet.
b. Wipe out tank with clean, lint free rag, taking
care not to introduce debris or dirt.
c. Replace the tank. Torque mounting bolts to 6-7
ft-lb. (8.5-10 Nm).
d. If only replacing the oil filter and maintenance is
complete, reinstall tank assembly on machine,
remove fill cap and refill tank with proper grade
of oil by using a funnel. Fill until oil is up to the
MAX level indicator on the side of the tank.
4. To remove the oil pickup line, squeeze retainer and
slide outward.
NOTE: There are two o-rings located in the valve for the pump out-
let.
5. Replace the o-rings if necessary.
6. Remove allen nut on the return/filter line and rotate
large retainer ring to remove return/filter line.
7. With the return line and the pickup tube removed,
the pump can be removed.
8. Loosen and remove the two hexhead nuts from the
pump and block.
NOTE: Be sure to remove and discard the plastic plug at the oil inlet
on the new pump before installing.
9. Check o-ring on valve block and replace if neces-
sary before installing the new pump.
NOTICE
NOTE TORQUE VALUES IN FIGURE 4-2. FOR THE VARIOUS FAS-
TENERS AND VALVES INSTALLED ON THE VALVE BODY. DO NOT
OVERTIGHTEN OR DAMAGE COULD OCCUR.
Pump Motor Removal
1. Remove the four bolts attaching the motor to the
valve adapter assembly.
2. Pull motor from valve.
3. Once all maintenance is performed, reinstall tank
assembly on machine, remove fill cap and refill tank
with proper grade of oil by using a funnel. Fill until oil
is up to the MAX level indicator on the side of the
tank.
Figure 4-1. Hydraulic Oil Check Procedure - All
Machines
1
2
3
4