TM 5-3805-281-24-1
Tests
SPEED SENSING SOLENOID VALVE (SD)
HARNESS TEST
ESSENTIAL TOOLS
JT07062 Test Harness
The purpose of test is to check continuity in wiring
harness to the speed sensing solenoid valve (C) coil and
there is a electrical signal from engine and pump
controller.
NOTE: Pressure reading displayed on the laptop
computer for "11 Speed sense control pressure" is
a calculated pressure from the electrical signal in
the engine and pump controller. When all
functions are in neutral, a typical reading of 563.9
psi is displayed at slow idle and 0.0 psi is
displayed at fast idle.
Increase the engine speed to approximately
1560--1600 rpm so the pressure reading just
goes to 0.0 psi. Operate the arm in function over
relief. The pressure reading will increase and then
stabilize at approximately 20--50 psi. The
readings indicates that the engine speed sensor is
OK, the electrical signal for target engine speed is
selected by the engine rpm dial and a electrical
9025
signal is generated. (For circuit operation, see
25
47
Engine Speed Sensing Control Circuit Operation
in Group 9025-05.)
A--Solenoid Valve Manifold
IMPORTANT: Turn key switch off before
B--Arm Regenerative Solenoid Valve (SC)
C--Speed Sensing Solenoid (SD)
disconnecting any electrical
D--Propel Speed Change Solenoid (SI)
connectors. Disconnecting electrical
E--Power Boost Solenoid (SG)
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,TX08227,3026 1917MAR981/2