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

September 2016
Machine Will
Not Lift, But
Power Unit
Will Operate
- AC 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.
Part No. 40462
While pushing in the
control activate switch
and activating the up
function, hold both
switches and check for
0V DC
input voltage at the N.O.
valve coil on the power
unit. Wait 1 second
before checking voltage.
Put Pos. lead of the
voltage meter on the
black 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 pressure gauge at
pressure port (stamped
1800 to
P) of power unit. Push in
2000 psi
the control activate
switch, activate the up
function, hold both
switches and check the
pressure.
less than 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 3000 psi
2000 psi
gauge teed in at the P
port fitting. Push in the
control activate switch,
activate the up function,
hold and check the
pressure.
less than 1800 psi
Continued on the next
page.
DPL-25S • DPL-30S • DPL-35S Super Series
Section 5 - Troubleshooting Flow Charts
While pushing in the
control activate switch
and activating the up
function, hold both
switches and check for 0V DC
power at terminal 12
(black wire) of the 13 pole
terminal strip (J1). This is
a 1 second ON time
delayed terminal.
12V DC
Replace or repair black
wire because of an open
circuit.
Replace N.O. valve coil.
Inspect the mast
assemblies for a
mechanical bind such as
foriegn objects that could
have fallen in between
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 lifting
cylinder.
12V DC
Replace defective N.O.
contact block for down
function in platform
control box.
Chart 5
Replace P.C. board.
5 - 13