TM 5-3805-280-24-1
Operational Checkout Procedure
SWING CIRCUIT
Run engine at slow idle.
YES: Go to next check.
LEAKAGE CHECK
Position machine on a side hill or raise one side of
NO: Check swing circuit
machine 300 mm (1 ft) with the boom and put blocks
leakage. Go to Group
under track.
9025-25.
9005
Position bucket 300 mm (1 ft) off the ground at
10
maximum reach.
14
T6479AZ
UN19OCT88
Actuate bucket curl function over relief.
NOTE: Actuating the bucket function releases the
mechanical swing park brake.
Does upperstructure move only slightly?
1/1
DIG FUNCTION DRIFT
Run engine at slow idle.
YES: Check cylinder drift.
CHECK
Go to Group 9025-25.
Inspect reduced leakage
Fill bucket with dirt. Position bucket at maximum reach
valves for boom down
with bucket 2 in. (50 mm) above ground.
and arm in functions. Go
to Group 3360.
Observe bucket for 1 minute.
NO: Go to next check.
Does bucket drift down to ground within 1 minute?
T6290AF
UN19OCT88
1/1
CONTROL VALVE LIFT
Run engine at slow idle.
YES: If functions move in
CHECK TEST
opposite direction first, a
leak at the lift check valve
Position machine as illustrated.
is indicated. Inspect lift
check valves. Go to
Slowly actuate pilot controller to lower boom, extend arm
Group 3360.
(retract cylinder), and dump bucket (retract cylinder).
NO: Go to next check.
Do functions move in opposite direction as control levers
are moved, then change direction as levers are moved
T6292AZ
UN19OCT88
further?
1/1
2-14
