Maxon TE-250C, Maintenance Manual

Page: 46 / 48

1
1921 Slauson
A
ve. Santa Fe Springs, CA. 90670 (800) 227-41
16 F
AX (888) 771-7713
46
PLATFORM WILL NOT LOWER, LOWERS TOO SLOWLY, OR TOO QUICKLY
1.
Connect voltmeter (+) lead to
motor solenoid terminal
“B”
and
the (-) lead to the ground wires
connection on pump
(FIG. 46-1)
.
Verify that full battery voltage
is at
“B”
. Recharge the battery
if voltmeter indicates less than
12.6 volts dc.
3.
Check if the
“D”
terminal and
“S2”
(lowering) solenoid valve
are getting battery voltage
(FIG.
46-2)
. Connect voltmeter nega-
tive (-) lead to ground (-) wires
connection on pump and posi-
tive (+) lead to the
“D”
terminal
(FIG. 46-2)
. Hold control switch
in the
“LOWER”
position. Then,
connect voltmeter (+) lead to
(+) terminal on the
“S2”
(lower-
ing) solenoid valve
(FIG. 46-2)
.
If voltmeter shows a much lower
reading than +12.6 volts dc 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
GRAVITY DOWN POWER UNIT
FIG. 46-1
POWER DOWN POWER UNIT
FIG. 46-2
TERMINAL “A”
LOAD
TERMINAL “B”
BATTERY (+)
STARTER
SOLENOID
VALVE “A”
LOWERING
SOLENOID VALVE
TERMINAL “C”
GROUND (-)
TERMINAL “D”
SWITCHED BATTERY
(+)
TERMINAL “A”
LOAD
TERMINAL “B”
BATTERY (+)
STARTER
SOLENOID
VALVE “S2”
LOWERING
SOLENOID VALVE
TERMINAL “C”
GROUND (-)
TERMINAL “D”
SWITCHED BATTERY
(+)