Part No. 29487
Genie Z-45/22
5 - 31
Service Manual - First Edition
Section 5 - Troubleshooting Flow Charts
12V
0V
function inoperative
less than 1200 PSI
1200
PSI
less than 1200 PSI
function
operates
0 or infinite ohms
4 to 5
ohms
function
operates
function
inoperative
Hold ground control
function switch and
check volts at red/blk
wire on primary function
directional valve.
Chart 19
Repair open in red/blk
wire circuit from TB2 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 B) with a
like valve (item C).
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 switch.
Counting the turns,
adjust the primary down
relief valve (item T) in
all the way. Then,
operate the function
down.
Check for mechanical
restrictions and/or a
condition exists in
which the cylinder
counterbalance valve
is not allowing the
cylinder to retract or
the cylinder has
internal defects.
Disconnecting
hydraulic lines or
adjusting the cylinder
counterbalance valve
in this situation can be
very dangerous
Please consult Genie
Industries service
department.
With primary boom fully
lowered, hold the
function down switch.
Adjust the relief valve to
read 1200 PSI and
replace the
counterbalance valve.
Adjust the primary down
relief valve (item T) in
one turn clockwise.
Then, with pressure
gauge still attached,
operate the function
down.
Continued on the next
page.
1200 PSI or more
With primary boom
fully lower, hold the
function down switch.
Adjust the relief valve
to read 1200 PSI.
Primary Boom
Down Function
Inoperative
Be sure all other
functions operate
normally including
primary up function.
If primary boom down
function operates
normally from the
ground controls but not
from the platform
controls, troubleshoot
the platform controller.
See Repair section.
If primary boom down
function operates
normally from the
platform controls but
not from the ground
controls, troubleshoot
the ground control
toggle switch. See
Repair section.
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