Maxon GPTLR Series - Platform will Not Lower, Lowers too Slowly, or too Quickly

11921 Slauson Ave. Santa Fe Springs, CA. 90670 (800) 227-4116 FAX (888) 771-7713
50
PLATFORM WILL NOT LOWER, LOWERS TOO SLOWLY, OR TOO QUICKLY
1. Connect voltmeter (+) lead to
starter solenoid terminal B and
the (-) lead to the ground wires
connection on pump (FIG. 50-1).
Verify that full battery voltage
is at B. Recharge the battery
if voltmeter indicates less than
12.6 volts DC, or 25.2 volts DC
for 24 volt system.
3. Check if the D terminal and sole-
noid valve S1 are getting battery
voltage (FIG. 50-2). Connect volt-
meter negative (-) lead to ground
(-) wires connection on pump and
positive (+) lead to the D terminal
(FIG. 50-2). Hold control switch
in the “DOWN” position. Then,
connect voltmeter (+) lead to (+)
terminal on the solenoid valve S1
(FIG. 50-2). If voltmeter shows
a much lower reading than +12.6
volts DC, or 25.2 volts DC for
24 volt system, or a reading of
0 volts, check for faulty control
switch and wiring. battery cable,
ground wire connections in pump
assembly, and pump motor.
2. Check for structural damage
or poor lubrication. Replace
worn parts.
TROUBLESHOOTING - Continued
GRAVITY DOWN POWER UNIT
FIG. 50-1
POWER DOWN POWER UNIT
FIG. 50-2
TERMINAL A
LOAD
STARTER
SOLENOID
GROUND
CONNECTION
TERMINAL “B”
BATTERY (+)
TERMINAL C
GROUND (-)
VALVE
S1
TERMINAL D
SWITCHED
BATTERY (+)
TERMINAL A
LOAD
STARTER
SOLENOID
GROUND
CONNECTION
TERMINAL B
BATTERY (+)
TERMINAL C
GROUND (-)
VALVE
S1
TERMINAL D
SWITCHED
BATTERY (+)