SkyTrak 6036 Operation Manual - Manual (Page 96)

Page 90 6036/6036T
17. Emergency Boom Lowering —
Electrical 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.
EXTEND/RETRACT SPOOL
COLLAR
Figure 64
OA0641
3. Thread a 3/8 NC x 2" Lg. capscrew into the spool
shift collar of the boom extend/retract spool (left
spool) on the main control valve (Figure 64).