SkyTrak 6036 Operation Manual - Manual (Page 92)

Page 86 6036/6036T
3. Clear area around the vehicle of all personnel.
4. Move the boom control lever to the left to retract
the boom.
After the boom has been retracted fully, proceed as
follows:
1. At the base end of each hoist cylinder, locate the
counterbalance valve cartridges (Figure 63).
OA0542
Figure 62
16. Emergency Boom Lowering —
Cable Control Joystick
A. Loss of Engine Power or Hydraulic Pump Failure:
In the event of total loss of engine power or hydraulics,
with an elevated load, the boom can be lowered to the
ground safely using the following procedures:
Warning
DO NOT get under a raised boom unless the boom is
blocked up. Always block the boom before doing any
servicing which requires the boom to be up.
IMPORTANT: If the boom has been extended, you must
first retract the boom before you attempt to lower it.
To retract the boom proceed as follows:
1. Block the boom so it cannot be lowered.
2. At the base end of the extend/retract cylinder,
locate the counterbalance valve cartridge (Figure
62). Loosen the retainer nut and turn the adjust-
ing screw in (clockwise) until it bottoms out.
Doing this will render the counterbalance valve
inoperative.
RETAINER NUT
COUNTERBALANCE VALVE
ADJUSTING SCREW
EXTEND/RETRACT
CYLINDER