Machine Will Not Lift, But Power Unit Will Operate - Dc Models - Genie DPL-25S Service Manual

Section 5 - Troubleshooting Flow Charts
Chart 7
Machine Will
Not Lift, But
Power Unit
Will Operate -
DC Models
Be sure the power
unit reservoir is full
and the breather cap
has been installed.
Be sure the manual
lowering cable is
properly adjusted.
5 - 18
While pushing in the
control activate switch
and activating the up
function, hold both
switches and check for
input voltage at the N.O. 0V DC
valve coil on the power
unit. Put Pos. lead of the
voltage meter on the
white wire and Neg. lead
on the green/yellow
grounding wire.
12V DC
infinite
Check the resistance of
ohms
the N.O. valve coil.
7 ohms
Tee in a 3000 psi
pressure gauge at the
pressure port fitting
1800 to
(stamped P) of the power
2000 psi
unit. Push in the control
activate switch, activate
the up function, hold both
switches and check the
pressure.
less tnan 1800 psi
On the power unit,
remove the return to tank
hose off of the T port
fitting and plug the hose
1800 to
fitting, leaving the 3000
2000 psi
psi gauge teed in at the P
port fitting. Push in the
control activate switch,
activate the up function,
hold both switches and
check the pressure.
less than 1800 psi
Continued on the next
page.
DPL-25S • DPL-30S • DPL-35S Super Series
Replace or repair the
white wire between the
motor contactor coil and
the N.O. valve coil
because of an open
circuit.
Replace the N.O. valve
coil.
Inspect the mast
assemblies for a
mechanical bind such as
foreign objects that could
have fallen in between
the columns.
Activate the up function
and check for voltage at
the N.C. down valve coils
0V DC
(yellow wire) at the barrel
end of each lift cylinder.
12V DC
Replace defective N.O.
contact block for down
function in the platform
control box.
September 2016
Remove the N.C. down
valves and inspect for
contamination or damage
OR consult Genie
Industries Service
Department.
Part No. 40462