POWER BOOST PROPORTIONAL SOLENOID
VALVE (SG) HARNESS TEST
JT07062 Test Harness
The purpose of test is to check continuity in the wiring
harness to the power boost solenoid valve (D) coil and
there is a signal from the engine and pump controller.
NOTE: Pressure reading shown on the laptop computer
for "12 Power boost control pressure" is a
calculated pressure from the electrical signal in
the engine and pump controller. A typical reading
of 426 psi is displayed when power boost switch
on the right control lever is pushed. A reading of 0
psi is displayed when the switch is not pushed.
The readings indicates that the power boost
switch is OK and a electrical signal is generated.
(For circuit operation, see Power Boost Control
Circuit Operation in Group 9025-05.)
The power boost solenoid valve is also actuated
in Precision Work Mode when boom up function is
A--Arm Regenerative Solenoid Valve (SC)
B--Speed Sensing Solenoid Valve (SD)
while engine is running or with key
C--Propel Speed Change Solenoid (SI)
D--Power Boost Solenoid Valve (SG)
switch on can damage engine and
pump controller or other electrical
1. Stop engine. Turn key switch to OFF.
2. Remove wire clip. Wiggle connector half and pull apart;
do not pull on wiring leads.
3. Install test harness in series with wiring harness and
power boost solenoid valve (D).
4. Turn key switch to ON but do not start engine.
Indicator light must come ON indicating there is
continuity in the wiring harness and there is a signal
from engine and pump controller.
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