Boom Lowering And Retracting - JLG sky trak mmv Service Manual

General Information, Specifications and Maintenance
13. Close the rear door.
WARNING:
over 20 mph. Carefully move the towing vehi-
cle into position. Always use a ground guide
and any device necessary to lift the tow bar
into position without standing directly between
vehicles. Failure to comply could result in vehi-
cle damage, or injury or death to personnel.
14. Position the towing vehicle in place. Using the tow
lugs, located at the rear of the vehicle, connect the
tow bar to the disabled vehicle.
15. Clear the area of any unnecessary personnel.
16. Carefully remove the wheel blocks from each of the
four tires. Tow the vehicle to a secure location.
17. Have an operator seated in the seat.
IMPORTANT! Tow or push the vehicle at a very slow
speed!
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.
18. Before placing the vehicle back into service,
disconnect the steer cylinder crossover hoses (1) by
removing he "male" nipple from the "female" coupler.
Re-install both dust caps (2 and 3).
1
2
2.80
DO NOT tow at speeds
DO NOT open the rear
1
3
OM1080
19. Re-install the ends of the drive shafts (4) to the front
and rear axle input yokes (5) using the straps (6) and
bolts (7) removed in step 4. Torque the M12 bolts to
156 lb/ft (212 Nm). Rotate the driveshaft hanger
hooks out of the way and install the driveshafts to the
front and rear axles.
5
7
4
20. Perform the steer indexing procedures. (Refer to
Section 9.9, Steer Indexing Procedures .)
2.14.3

Boom Lowering and Retracting

In the event of total loss of engine power or hydraulic pump
failure, emergency boom lowering procedures are listed in
Section 4.3, Boom Assembly Maintenance . Two types of
conditions requiring emergency boom lowering are
addressed; Engine or Hydraulic Pump Failure (refer to
Section 4.3.10, a. Engine or Hydraulic Pump Failure ) or
Hydraulic Line Failure (refer to Section 4.3.10, b.
Hydraulic Line Failure ).
IMPORTANT: In the event of total loss of engine power
or hydraulic pump failure with an elevated load, properly
evaluate and deal with each situation on an individual
basis. Contact the nearest JLG Authorized Service Cen-
ter (ASC) or the JLG Service Department for specific
instructions.
6
Model MMV Rev. 12/04
MM2220