TM 5-3805-280-10
Operational Checkout
YES: Go to next check.
SWING CIRCUIT
Engine at slow idle.
LEAKAGE CHECK
NO: Go to your
Position machine on a side hill or raise one side of
authorized dealer.
machine 300 mm (1 ft) with the boom and ease block
under track.
Position bucket 300 mm (1 ft) off the ground at
maximum reach.
T6479AZ UN19OCT88
Bottom bucket cylinder and hold lever in the actuated
position.
NOTE: Actuating the bucket function releases the
mechanical swing brake.
Does upperstructure move only slightly?
1/1
DIG FUNCTION DRIFT
Engine at slow idle.
YES: Go to your
CHECK
authorized dealer.
Fill bucket with dirt and position bucket at maximum
reach with bucket 2 in. (50 mm) above ground.
NO: Go to next check.
Observe bucket for 1 minute.
Does bucket drift down to ground within 1 minute?
T6290AF UN19OCT88
1/1
CONTROL VALVE LIFT
Engine at slow idle.
YES: If functions move in
CHECK TEST
opposite direction first, a
leak within the cylinder or
Position machine as illustrated.
lift check valve is
indicated. Go to your
Slowly actuate pilot controller to lower boom, extend arm
authorized dealer.
(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
21-11
