Brake Release Function Inoperative - Genie GR-8 Service Manual

Section 5 • Troubleshooting Flow Charts
Chart 10A
Brake
Release
Function
Inoperative
Be sure the circuit
breaker and fuses
are not tripped or
blown.
Be sure the
batteries are fully
charged and
properly connected.
5 - 14
wheels
Chock the wheels at the
turn
steer end of the
manchine. Raise the
non-steer end of the
machine and place
blocks under the chassis
for support.
After serial number
248: Activate the brake
release valve (item I) on
the function manifold.
All models:
With key switch turned
to platform controls and
both Emergency Stop
buttons pulled out to the
position, move the
ON
lift/drive select switch
TS16 to the drive
position. Press and hold
the function enable
switch SW5. Move the
joystick controller JC3 in
the drive forward
direction, then release it.
Turn each wheel by
hand. Each wheel
should turn freely
without much effort.
wheels do
not turn
Connect a 0 to 3000 PSI
2700
(207 bar) pressure
psi or
gauge to the test port on
more
the function manifold
(item A). Activate drive
forward and record the
reading on the pressure
gauge.
less than
2700 psi
Adjust the system
pressure relief valve
(item H) (See Repair
Section).
GR-8 • GR-12 • GR-15
The machine is
functioning properly.
no
Remove both brake
hydraulic
hoses from the brake
oil
fittings and place them
in a suitable container.
Activate drive forward
and check for hydraulic
fluid from each hose.
hydraulic oil
Repair OR replace the
brakes
.
August 2005
REV A
Consult the Genie
Industries Service
Department.
Part No. 72965