Genie GTH-636 Service Manual page 86

Section 4 • Repair Procedures
BOOM COMPONENTS
How to Bleed the Lift/Tilt Circuit
1 With the machine on a firm, level surface, start
the engine and allow the engine to idle.
2 Raise the boom to full height, then lower the
boom to the stowed position.
3 Repeat step 2.
4 Raise the tips of the lifting forks to full height,
then continue to activate the fork tilt up function
for a minimum of 60 seconds. Release the
joystick.
5 Stop the engine.
6 Select one of the boom lift cylinders. Locate the
bleed fitting at the top of the cylinder.
7 Securely install a clear hose onto the bleeder
fitting. Place the other end of the hose into a
suitable container to collect hydraulic fluid.
8 Using a wrench, carefully open the bleeder
fitting on the cylinder and allow the pressurized
fluid to drain through the hose and into the
container. Close the bleeder fitting.
Bodily injury hazard. Spraying
hydraulic oil can penetrate and
burn skin. Loosen hydraulic
connections very slowly to allow
the oil pressure to dissipate
gradually. Do not allow oil to
squirt or spray.
9 Start the engine and allow the engine to idle.
10 Activate the fork tilt up function for
approximately 15 seconds.
11 Repeat this procedure beginning with step 8
until a steady stream of oil without air bubbles is
visible through the bleeder hose.
12 Repeat this procedure for the other cylinder,
beginning with step 6.
4 - 16 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
June 2007
REV C
Part No. 97487