Test The Drive Brakes; Test The Drive Speed - Stowed Position - Genie Z80/60 Service Manual

June 2011
REV G
B-14

Test the Drive Brakes

Proper brake action is essential to safe machine
operation. The drive brake function should operate
smoothly, free of hesitation, jerking and unusual
noise. Hydraulically-released individual wheel
brakes can appear to operate normally when they
are actually not fully operational.
Collision hazard. Be sure that the
machine is not in free-wheel or
partial free-wheel configuration.
See B-8, Confirm the Proper
Brake Configuration .
Note: Select a test area that is firm, level and free
of obstructions.
1 Mark a test line on the ground for reference.
2 Start the engine from the platform controls.
3 Press the engine rpm select button until the foot
switch activated high idle (rabbit and foot switch
symbol) is selected, then lower the boom into
the stowed position.
4 Choose a point on the machine (i.e., contact
patch of a tire) as a visual reference for use
when crossing the test line.
5 Bring the machine to top drive speed before
reaching the test line. Release the drive
controller when your reference point on the
machine crosses the test line.
6 Measure the distance between the test line and
your machine reference point. Refer to
Section 2, Specifications .
Note: The brakes must be able to hold the machine
on any slope it is able to climb.
Part No. 88619
Section 3 • Scheduled Maintenance Procedures
CHECKLIST B PROCEDURES
B-15
Test the Drive Speed -
Stowed Position
Proper drive function movement is essential to
safe machine operation. The drive function should
respond quickly and smoothly to operator control.
Drive performance should also be free of
hesitation, jerking and unusual noise over the
entire proportionally controlled speed range.
Note: Select a test area that is firm, level and free
of obstructions.
Note: Perform this procedure with the boom in the
stowed position.
1 Create start and finish lines by marking two
lines on the ground 40 feet / 12.2 m apart.
2 Start the engine from the platform controls.
3 Press the engine rpm select button until the foot
switch activated high idle (rabbit and foot switch
symbol) is selected.
4 Choose a point on the machine; i.e., contact
patch of a tire as a visual reference for use
when crossing the start and finish lines.
5 Bring the machine to top drive speed before
reaching the start line. Begin timing when your
reference point on the machine crosses the
start line.
6 Continue at full speed and note the time when
the machine reference point crosses the finish
line. Refer to Section 2, Specifications .
Z-80/60 3 - 31