SkyTrak 6036 Operation Manual - Manual (Page 95)

Page 89 6036/6036T
1. Remove the blocking that is supporting the boom.
2. If the line failure is in the boom hoist line the boom
must be lowered by following the next step.
a. Using two people to perform this procedure
will make boom lowering much easier. At the
base end of each hoist cylinder, locate the
counterbalance valve cartridges (Figure 63).
Loosen the retainer nut and control the rate of
boom lowering by turning the adjusting screw
on each cartridge simultaneously into the
cartridge very slowly (clockwise). Hydraulic
oil from inside the hoist cylinders will escape
through the fault in the line.
3. If the line failure is in the boom lowering line the
boom must be lowered by following the next 3
steps.
a. At the base end of each hoist cylinder, locate
the counterbalance valve cartridges (Figure
63). Loosen the retainer nut on each cartridge
and turn the adjusting screws in (clockwise)
until they bottom out. Doing this will render
each 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 forward to lower
the boom.
IMPORTANT: This procedure is to be used in emergency
situations only. By turning the counterbalance cartridge
adjusting screws to lower the boom, the pressure settings
of the cartridge have been altered. DO NOT attempt to
reset these cartridges. Remove and replace all three
cartridges with new parts. Failure to replace these
cartridges with new parts will result in erratic (extreme
bouncing) lowering action, which may cause damage to
other components.