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42
TROUBLESHOOTING - Continued
PLATFORM RAISES BUT LEAKS DOWN
3. Check if solenoid valve is con-
stantly energized. Connect volt-
meter negative (-) lead to ground
(-) connection on pump and
positive (+) lead to (+) terminal on
valve A (FIG. 42-2). If voltmeter
reads battery voltage, check for
faulty wiring or toggle switch.
GRAVITY DOWN POWER UNIT
FIG. 42-2
1. Check for external leaks, leaking
lines and fi ttings at the cylinders
and pump assembly.
CHECKING HYDRAULIC LOCK VALVE
FIG. 42-1
HYDRAULIC LOCK
VALVE
RH CYLINDER
2. Check that hydraulic lock valve is
not stuck in the open position
(FIG. 42-1).
TERMINAL A
LOAD
STARTER
SOLENOID
GROUND
CONNECTION
TERMINAL B
BATTERY (+)
TERMINAL C
GROUND (-)
VALVE S1
TERMINAL D
SWITCHED
BATTERY (+)
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