JLG sky trak mmv Service Manual page 95

WARNING:
WHEELS. Failure to do so could result in
death or serious injury from vehicle roll-away.
3. Block all four wheels to help prevent the vehicle
from moving after the parking brake is disabled.
4. Remove the four bolts (4) and two straps (5)
securing the bearing crosses to the front and rear
axle input yokes (6).
5. Secure the unattached end of the drive shaft (7) in
hanger hook (8) provided underneath the frame of
the vehicle. Rotate the hanger hooks into position to
hold the driveshaft. The hanger hooks have spring
tension applied to hold them in position
6
8
4
7
6. Turn the ignition switch to the ON position (with the
engine not running), release the parking brake
switch.
Note: With the ignition switch in the ON position, the low
brake pressure buzzer will sound continuously until the
towing operation is complete and ignition switch turned
to the OFF position.
7. Open the engine compartment cover. Allow the
hydraulic oil to cool.
8. Locate the emergency towing pressurizing valve (9)
located under the radiator on the mounting bracket.
Model MMV Rev. 12/04
General Information, Specifications and Maintenance
BLOCK ALL FOUR
5
9. Use the handle (10) on the emergency towing valve
to pump pressure into the system. Watch the
pressure gauge (11) while pumping pressure into
the park brake system. DO NOT exceed 650 psi
(45 bar).
CAUTION:
(45 bar) when pressurizing the park brake.
Applying too much pressure may damage the
brake seals.
9
11
10. Turn the steering wheel until the front tires are
pointed in a straight ahead position.
MM2220
WARNING:
door with the air conditioner rocker switch in
the ON position and the fan switch turned to
the ON position. Contact with moving parts can
cause death or serious personal injury.
11. Open the rear door. Remove the dust cap (1) from
the "male" nipple on one crossover hose. Remove
the dust cap (2) from the "female" quick disconnect
on the other crossover hose. Couple the quick
disconnects together.
12. With the crossover hoses (3) coupled together, the
rear wheels will be free to steer, thus "tracking" as
the vehicle is being towed.
DO NOT exceed 650 psi
10
DO NOT open the rear
OM1051
2.79