TM 5-3805-280-24-1
Operational Checkout Procedure
Engine at fast idle.
PROPEL SYSTEM
YES: Inspect flow
TRACKING CHECKS
combiner valve, propel
WHILE OPERATING A
flow control valve, and
Propel speed switch in fast speed (rabbit).
DIGGING FUNCTION
propel-boom down
selector valve in the
Propel machine at full speed forward on a flat and level area.
control valve. Go to
9005
Group 3360.
After machine is moving, slowly move the arm control lever from neutral to full
10
actuation to extend the arm.
16
NO: Go to next check.
Does machine mistrack excessively when the arm is extended?
NOTE: Machine will slow down during this test.
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Engine at fast idle.
PROPEL SYSTEM
YES: Go to next check.
MANEUVERABILITY
CHECK
Propel speed switch in fast speed (rabbit).
NO: Inspect
counterbalance valve. Go
Propel machine at full speed forward down a slope.
to Group 0260.
Turn in each direction.
Repeat the procedure in reverse.
Does each track slow down in response to pedal or lever movement in order to turn?
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PROPEL SPEED
A--Propel Speed Switch
YES: Go to next check.
SELECTION CHECK
Engine at fast idle.
NO: Check propel
pressure switches and
Turn propel speed switch (A) to slow speed (turtle).
sensors. Go to Group
9015-15. Go to Propel
Actuate propel function to full speed.
Motor Speed Change
Circuit Operation in
Group 9025-05.
Turn propel speed switch to fast speed (rabbit).
Does machine travel speed increase?
Actuate a dig function and then return to neutral.
Does machine travel speed decrease and then increase?
Turn propel speed switch to slow speed (turtle).
Does machine travel speed decrease?
T102104 UN26JUL96
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