Check The Directional Valve Linkage; Test The Platform Self-Leveling - Genie Z-60/34 Service Manual

Section 3 • Scheduled Maintenance Procedures
CHECKLIST B PROCEDURES
B-12
Check the Directional Valve
Linkage
Perform this test only on models
equipped with a oscillating axle.
Proper axle oscillation is essential to safe machine
operation. If the directional valve linkage is not
operating correctly, the stability of the machine is
compromised and it may tip over.
1 Remove the drive chassis cover and the axle
covers from the non-steer end of the drive
chassis.
2 Locate the directional valve inside of the non-
steer axle and inspect the linkage for the
following:
· Lock nut is tight against yoke
· Yoke clevis pins are installed
· Cotter pins are installed through clevis pins
· Linkage is properly attached to
directional valve
a
b
c
d
a directional valve
b clevis pin with cotter pin (hidden)
c yoke
d lock nut
3 - 26
B-13

Test the Platform Self-leveling

Automatic platform self-leveling throughout
the full cycle of boom raising and lowering is
essential for safe machine operation. The
platform is maintained at level by the platform
leveling slave cylinder which operates in a closed
loop hydraulic circuit with the master cylinder
located at the base of the boom.
A platform self-leveling failure creates an unsafe
working condition for platform and
ground personnel.
1 Start the engine from the ground controls and
lower the boom into the stowed position.
2 Hold the function enable toggle switch to either
side and adjust the platform to a level position
using the platform level toggle switch.
3 Raise and lower the primary boom through
a full cycle.
Result: The platform should remain level at
all times to within ±5 degrees.
Genie Z-60/34
November 2003
REV A
Part No. 75861