TM 5-3805-280-24-1
Tests
ARM REGENERATIVE PROPORTIONAL
SOLENOID VALVE (SC) HARNESS TEST
ESSENTIAL TOOLS
JT07062 Test Harness
The purpose of harness test is to check continuity in
wiring harness to the arm regenerative solenoid valve (A)
coil and there is a electrical signal from engine and pump
controller.
NOTE: Pressure reading shown on the laptop computer
for "9 Arm regenerative control pressure" is a
calculated pressure from the electrical signal in
the engine and pump controller. A typical reading
is 399.3 psi while operating the boom up and arm
in functions in combined operation with engine
speed at 1200 rpm or less. The reading indicates
that the rear pump pressure sensor, arm in
pressure sensor, and boom up pressure switch
are OK and a electrical signal is generated. When
all functions are in neutral, a typical reading of
170.4 psi is displayed at fast or slow idle. The
reading can vary from machine to machine. What
to look for is that there is a reading and it
increases when arm in regenerative function is
A--Arm Regenerative Solenoid Valve (SC)
actuated. (For circuit operation, see Arm
9025
B--Speed Sensing Solenoid Valve (SD)
Regenerative Valve Operation in Group 9025-05.)
25
C--Propel Speed Change Solenoid (SI)
40
D--Power Boost Solenoid Valve (SG)
The arm in regenerative function does not operate
in Grading and Precision Work Modes.
IMPORTANT: Disconnecting electrical connectors
while engine is running or with key
switch on can damage engine and
pump controller or other electrical
components.
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
arm regenerative solenoid valve (A).
Continued on next page
TX,25,GG2220 1921MAY981/2
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