JLG 80HX_HX+6_HXER Service Manual - Manual (Page 82)

SECTION 2 - PROCEDURES
2-60 – JLG Lift – 3120863
13. Install capscrews (12) and tighten evenly to draw
end cover (13) to housing (7). Torque capscrews to
55 ft. lbs. (75 NM).
NOTE: If available a hydraulic press will simplify installation
of end cover on housing. Clamp cover in position
while tightening the capscrews.
14. If hydrostatic bench testing is performed on the
brake assembly, release pressure should not
exceed 2000 psi (137 Bar) unless two additional
bolts are used for supplemental clamping.
2.22 CONTROLLERS
PQ
Refer to separate publication (3120351) for complete trou-
bleshooting, wiring and replacement parts.
OEM
Refer to separate publication (3120344) for description
troubleshooting, wiring and replacement parts.
VICKERS (All Hydraulic)
Refer to separate publication (3120335) for complete trou-
bleshooting, wiring and replacement parts.
2.23 OSCILLATING AXLE BLEEDING
PROCEDURE
Lockout Cylinder Bleeding (Without Holding
Valves)
1. Make a hydraulic hose using approximately 6 feet of
1/4 in. wire braid hose with quick connect fitting on
one end and a 1/4 in. JIC female fitting on the other.
2. Swing the boom over the front of the machine and
engage the turntable lock. Using ground control
raise the boom out of the way.
3. Remove the cover between frame slabs through
which the cam valve wheel protrudes.
4. Remove cap from fitting on cam valve and connect
your hose (see 1 above) at this point.
5. Attach the other end of the hose to the quick con-
nect on the swing brake.
6. Using a floor jack (or overhead crane) raise one
front wheel approximately 6 inches (15.2 cm) off the
ground.
7. Use a bar as a lever to press down on the cam valve
plunger which will allow the axle to fully oscillate
against the stop.
8. With the aid of an assistant, start the engine from
ground control.
ENSURE TURNTABLE LOCK IS ENGAGED.
9. While your assistant activates swing from ground
control, depress plunger on cam valve and open
both bleeders on the lockout cylinder of the elevated
wheel purging any air.
10. Remove the jack from the elevated wheel and, using
the bar, again press down on the cam valve plunger,
allowing the axle to center.
11. Next raise the other front wheel as you did in step 6
and repeat steps 7 thru 10.
12. Shut down the engine, remove the hose, and
replace the cap on the cam valve fitting. Install frame
cover over cam valve and disengage turntable lock.
13. The boom can now be returned to its normal posi-
tion.
Lockout Cylinder Bleeding (With Holding
Valves)
ENSURE PLATFORM IS FULLY LOWERED AND BOOM IS CEN-
TERED OVER REAR AXLE PRIOR TO BEGINNING BLEEDING
PROCEDURE.
MAKING SURE MACHINE IS ON A LEVEL SURFACE AND REAR
WHEELS ARE BLOCKED, DISENGAGE DRIVE HUBS. OPTIONAL
4WD ALL HUBS MUST BE DISENGAGED.
1. Making sure machine is on a level surface and rear
wheels are blocked, disengage drive hubs. Optional
4WD all hubs must be disengaged.
2. Make up an adapter with an air regulator, remove
filler cap on hydraulic tank and install regulator.
3. Attach air supply to the regulator and set regulator to
2 - 5 psi (0.14-0.34 Bar).
DO NOT EXCEED 5 PSI (0.34 BAR) INTO HYDRAULIC TANK.
MORE THAN 5 PSI (0.34 BAR) WILL CAUSE DAMAGE TO THE
HYDRAULIC TANK.
4. Activate machine hydraulic system from platform
control station.
5. Place LOW ENGINE, HIGH DRIVE SPEED and HIGH
WHEEL MOTOR SPEED control switches to their
respective HIGH positions.