Part No. 29487
Genie Z-45/22
5 - 27
Service Manual - First Edition
Section 5 - Troubleshooting Flow Charts
less than 1200 PSI
1200 PSI or more
12V
0V
function
operates
function does not operate
less than 1200 PSI
1200
PSI
0 or infinite ohms
4 to 5
ohms
function
operates
function
inoperative
Hold ground control
function switch and
check volts at blu/blk
wire on secondary
function directional
valve.
Chart 17
Secondary
Boom Down
Function
Inoperative
Be sure all other
functions operate
normally including
secondary up function.
If secondary boom
down function operates
normally from the
ground controls but not
from the platform
controls, troubleshoot
the platform controller.
See Repair section.
If secondary boom
down function operates
normally from the
platform controls but
not from the ground
controls, troubleshoot
the ground control
toggle switch. See
Repair section.
Repair open in blu/wht
wire circuit from TB11 to
directional valve.
Hold toggle switch down
and manually override
the down directional
valve (push in button on
end of valve spool).
Note: overriding the
valve will require two
people. If a helper is not
available, interchange
the valve (item C) with a
like valve (item B).
Check the resistance of
the down directional
valve coil.
Replace the valve.
Replace the coil.
Install a pressure gauge
at the quick disconnect
coupling on the function
manifold and hold the
function down switch.
Counting the turns,
adjust the secondary
down relief valve (item
U) in all the way. Then,
operate the function
down.
Check for mechanical
restrictions and/or a
condition exists in
which the cylinder(s)
counterbalance valves
are not allowing the
cylinders to retract or
the cylinders have
internal defects.
Disconnecting
hydraulic lines or
adjusting the cylinder
counterbalance valves
in this situation can be
very dangerous
Please consult Genie
Industries service
department.
With secondary boom
fully lowered, hold the
function down switch.
Adjust the relief valve to
read 1200 PSI and
replace the
counterbalance valves.
Adjust the secondary
down relief valve (item
U) in one turn clockwise.
Then, with pressure
gauge still attached, hold
the function down
switch.
Continued on the next
page.
With secondary boom
fully lower, hold the
function down switch.
Adjust the relief valve
to read 1200 PSI.
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