JLG 800A_AJ ANSI Service Manual - Manual (Page 318)

SECTION 5 - HYDRAULICS
5-38 – JLG Lift – 3120740
11. Disconnect the 1/4" hose at the port marked "MT"
(plug the port). Drain the hose into a container that
will hold approx. 2 gallons (8 L). Activate platform
rotate and hold for approx. 60 seconds each direc-
tion. Reconnect the hose to port "MT"
12. Raise the tower boom to the end of stroke. Discon-
nect the hose from port #1 (plug the port) and drain
into a container that will hold approx. 3 gallons (11.5
L). Activate tower telescope out. At end of stroke,
reconnect the hose and retract the tower telescope
cylinder.
13. Disconnect the hose at port #9 (plug the port), and
drain into a container that will hold approx. 4 gal-
lons. Activate main telescope out. At end of stroke,
reconnect the hose and retract the telescope func-
tion.
14. From the ground control, tilt the platform back to the
end of stroke. Turn off the engine. Locate the master
cylinder and disconnect the rod end hose (plug the
port). NOTE: THERE WILL BE PRESSURE IN THIS
CIRCUIT. Drain this hose into a container that will
hold approx. 2 gallons, and activate platform level
down, to end of stroke. Reconnect hose. Cycle plat-
form level, 2 more times. Raise the tower boom to
full height. Disconnect the hose at port #12 and
drain into a container that will hold approx. 10 gal-
lons. Activate upper lift down to the end of stroke.
Reconnect the hose to port #12. Disconnect the
hose on port #11 (plug the port) and drain into a
container that will hold approx. 10 gallons (38 L).
Activate lift up to end of stroke. Reconnect the hose
to port #11.
NOTE: After all functions have been cycled 2-3 times, check
the hydraulic oil tank level.
5.11 HYDRAULIC COMPONENT START-UP
PROCEDURES AND
RECOMMENDATIONS
From a hydrostatic component standpoint, the goal at
system start up is to put into functional operation, the
hydrostatic system in such a way as to preserve the
designed life span of the system. The following start-up
procedure should be adhered to whenever a new pump
or motor is initially installed into a machine, or a system is
restarted after either a pump or motor has been removed
and/or replaced.
THE FOLLOWING PROCEDURE MAY REQUIRE THE MACHINE TO
BE DISABLED (WHEELS RAISED OFF THE GROUND, WORK FUNC-
TIONS DISCONNECTED, ETC.) WHILE PERFORMING THE PROCE-
DURE IN ORDER TO PREVENT INJURY. TAKE NECESSARY SAFETY
PRECAUTIONS BEFORE MOVING THE VEHICLE/MACHINE.
Prior to installing the pump and/or motor, inspect the
unit(s) for damage that may have been incurred during
shipping and handling. Make certain that all system com-
ponents (reservoir, hoses, valves, fittings, heat exchanger,
etc.) are clean prior to filling with fluid.
Fill the reservoir with recommended hydraulic fluid. This
fluid should be passed through a 10 micron (nominal, no
bypass) filter prior to entering the reservoir. The use of
contaminated fluid will cause damage to the components,
which may result in unexpected vehicle/machine move-
ment.
NOTE: If a pump or motor is being replaced due to internal
damage, the remaining units (pump or motors) need
to be inspected for damage and contamination, and
the entire hydraulic system will need to be flushed
and the fluid replaced. Failure to do so may cause
considerable damage to the entire system.