TM 5-3805-281-24-1
Tests
PROPEL SPEED CHANGE SOLENOID VALVE
(SI) HARNESS TEST
ESSENTIAL TOOLS
JT07062 Test Harness
The purpose of test is to check continuity in wiring
harness to the propel speed change solenoid valve (B)
coil and there is a signal from engine and pump
controller.
NOTE: The reading displayed on the laptop computer for
"10 Propel motor control pressure" is a calculated
pressure from data stored in the engine and pump
controller. A typical reading of 65.9 psi is
displayed when propel function is in neutral or
propelling at slow speed. A typical reading of 426
psi is displayed when propelling in fast speed with
no other function actuated. The readings can vary
from machine to machine. What to look for is that
there is a reading and it increases when fast
speed propel function is actuated.
The readings indicates that the propel speed
switch, propel and dig pressure switches, front
and rear pump control pressure sensors, front and
rear pump pressure sensors are OK, and a
9025
electrical signal to the propel speed change
25
49
solenoid valve is generated. (For circuit operation,
see Propel Motor Speed Change Circuit Operation
in Group 9025-05.)
A--Solenoid Valve Manifold
B--Arm Regenerative Solenoid Valve (SC)
C--Speed Sensing Solenoid (SD)
IMPORTANT: Turn key switch off before
D--Propel Speed Change Solenoid (SI)
disconnecting any electrical
E--Power Boost Solenoid (SG)
connectors. 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.
Continued on next page
CED,TX08227,3025 1917MAR981/2
