SkyTrak 6036 Operation Manual - Manual (Page 94)

Page 88 6036/6036T
IMPORTANT: If the boom has been extended, you must
first retract the boom before you attempt to lower the boom.
To retract the boom proceed as follows:
1. Block the boom so it cannot be lowered.
2. If the line failure is isolated to the hoist circuitry
only, boom retraction can be performed by operat-
ing the boom control lever in the normal fashion.
3. If the line failure is in the boom extend line the
boom must be retracted by following the next step.
a. At the base end of the extend/retract cylinder,
locate the counterbalance valve cartridge
(Figure 62). Loosen the retainer nut and
control the rate of retraction by turning the
adjusting screw into the cartridge very slowly
(clockwise). Hydraulic oil from inside the
extend/retract cylinder will escape through the
fault in the line.
4. If the line failure is in the boom retract line the
boom must be retracted by following the next 3
steps.
a. At the base end of the extend/retract cylinder,
locate the counterbalance valve cartridge
(Figure 62). Loosen the retainer nut and turn
the adjusting screw in (clockwise) until it
bottoms out. Doing this will render the
counterbalance valve inoperative.
b. Clear the area around the vehicle of all
personnel and return to the operator's cab.
c. Move the boom control lever to the left to
retract the boom.
5. If the line failure was isolated to the extend/retract
circuit only, the boom can now be lowered by
operating the boom control lever in the normal
fashion after the blocking is removed.
After the boom has been retracted fully, proceed as follows: