TM 5-3805-281-24-1
Operational Checkout Procedure
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).
9005
10
NO: Go to next check.
Do functions move in opposite direction as control levers
16
are moved, then change direction as levers are moved
T6292AZ
UN19OCT88
further?
1/1
Engine at fast idle.
YES: Go to next check.
BOOM UP, ARM IN, AND
BUCKET COMBINED
OPERATION CHECK
Work mode selector in dig mode.
NO: Inspect bucket flow
control valve in control
valve if boom speed
Actuate the boom up function, arm in function and then the bucket function.
slows excessively. Go to
Group 3360.
Does boom continue to move at approximately the same speed after bucket function is
actuated?
1/1
Engine at fast idle
ARM REGENERATIVE
YES: Go to next check.
VALVE OPERATION
CHECK
Work mode selector in dig mode.
NO: Check the rear pump
pressure sensor, arm in
Extend the arm to full extension and then lower boom so bucket is on the ground.
pressure sensor, boom
up pressure switch, and
arm regenerative solenoid
Actuate the boom up and arm in functions in combined operation.
valve. Go to Group
9015-15.
Does the arm move smoothly through the complete cycle and not hesitate when it
goes through the vertical position?
IF OK: Check the arm
regenerative valve in the
control valve. Go to
Group 3360.
1/1
2-16
