TM 5-3805-281-24-1
Diagnostic Information
Part Name
Arm II Power Passage
Arm Regenerative Valve
Boom Regenerative Valve
Propel Flow Control Valve
Check Valve and
Restriction Orifice in
Right Control Valve
Operational
To ensure supply oil
To route oil from rod end to
To route return oil from
To ensure supply oil
Function
pressure to boom I and
head end of cylinder during
head end to rod end of
pressure to boom II spool
bucket spool when used in
arm in when shifted by arm
boom cylinder to prevent
when propel and boom up
combined operation with
regenerative solenoid valve.
cavitation when lowering.
function are operated in
arm function. Check valve
combined operation.
serves as a lift check valve
for arm II spool.
Control Problems
No supply oil flow from right
No pressure signal from
Sticking or stuck check
Supply oil flow not
control valve power
arm regenerative solenoid
valve.
restricted or no boom up
passage to arm II spool if
valve to shift arm
pilot control signal to shift
check valve stuck closed or
regenerative valve spool.
propel flow control valve
orifice is clogged.
Valve spool is sticking or
piston.
stuck.
Machine Symptoms
Arm speed is slow when
During arm in, there is arm
Boom lower speed
When stuck closed, shocks
use in combined operation
cylinder cavitation and
becomes slow with check
felt when changing from
with boom or bucket. When
controllability becomes less.
valve stuck closed. Cannot
propel to combined propel
check valve is stuck open,
raise tracks off the ground
and dig operation. When
arm may moved in opposite
using boom down with
stuck open, no boom up
direction at control lever
check valve stuck open.
when combined with propel
actuation then change
down a slope and bucket
direction.
loaded.
Laptop Computer
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Self-Diagnostic
Functions
Laptop Computer
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Monitoring Function
9025
Harness Check
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15
Notes
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8
Description of
See Control Valve Circuit
See Arm Regenerative
See Boom Regenerative
See Propel Flow Control
Operation
Schematic in Group
Valve Operation in Group
Valve Operation in Group
Valve Operation in Group
9025-05.
9025-05.
9025-05.
9025-05.
Continued on next page
CED,TX08227,3177
1904JUN987/9
6-115
