Service Manual

Inspection Results
Oil is fairly clean - no signs of
water or overheating
Spool valve works smooth
Hydro
is clean
Hoses appear in good shape
Does not apply
- unit drives great
so the problem is in the lift circuit.
Drive operation
OK
Engine runs OK.
Lift system does not work. Seems
like
it tries to raise deck.
Noisy when spool valve
is off
center.
Step 3: Inspect The Machine
Its now time to collect physical evidence. Again,
take notes on what you see.
Inspect the the oil in the unit.
Is the oil level correct? Does it look
black(Dirt)? Does it
look milky (Water)? Does
it smell burnt( Overheated)? Are there
bubbles in the reservoir (Airleak)?
Inspect the outside
of the hydraulic system.
Does the control linkage work properly?
Does it have full travel?
Is it secure? Is there
debris around the hydraulic components?
Are the hoses/lines kinked? Are there any
signs
of leakage?
Inspect the drive, for the system.
Does the input drive line
look normal? Are
there signs of slippage in the system?
Does everything seem secure? Are the drive
keys in place? Can you push the unit without
activating the push valve?
Inspect the output drive
.
Step 4: Operate the Machine to Verify-
If the machine still operates, use the detailed
problem description to verify what the operator
experienced. Use circumstances similar to those
provided in the problem description to reproduce
the problem.
While operating the unit, note anything that may
affect the hydraulic systems operation. How well
does the engine run? Do the brakes work
properly? Are there any belts slipping? Do the
controls work smoothly? Does the system
operate properly in one direction and not the
other?
Be sure to record all your observations.
Productivity Series
2%