Mast Cushion
Check - Free Lift
Cylinder
NOTE:
This check applies to free lift cylinders.
1.
Raise forks at maximum lift speed with no load.
2.
When free cylinder reaches top of stroke, ob-
serve transition to main lift cylinder phase and
speed of free lift rod during transition.
Does free lift rod speed slow and does hissing
sound come from top of cylinder, with no au-
dible impact at top of stroke?
YES:
Free lift is OK. Go to
next check.
NO:
Remove oil fill port
screw at top of free lift cylin-
der; add 100 cc (3.40 oz) of
hydraulic oil. Depending on
your lift truck see,
Cylinder
Repair (Mast S/N A270-72,
A551, A555, A559, A626,
A627, A751-52, B551, B555,
B586-91, B749-54, C661-63,
C665, D507-09, D515,
D562-64, E509, E564)
2100SRM1382 or
Cylinder
Repair (Mast S/N B551,
B555, B559)
2100SRM1440.
Lift Drift Check
Ensure the following before starting procedure:
•
Truck operating on flat surface.
•
Hydraulic oil at operating temperature.
WARNING
Ensure load is secured so it will not
move when mast is tilted fully for-
ward.
•
Secured capacity load on forks.
1.
Install angle meter on mast and position mast
at approximately 90° angle to ground.
2.
Raise mast until approximately 75 mm (3 in.) of
main lift cylinder rods are exposed on mast.
Record this measurement.
3.
Shut lift truck
OFF
.
4.
After 5 minutes, measure mast main lift cylin-
der drop.
Does main lift cylinder rod retract more than
50 mm (2 in.)?
YES:
Leakage Test to isolate if
problem is in cylinder or con-
trol valve.
NO:
Main cylinder drift is OK.
Continue with this procedure.
Continue:
5.
Raise free lift cylinder approximately
75 mm (3 in.) and mark cylinder rod to record
movement.
6.
After 5 minutes, measure free lift cylinder drop.
Does free lift drop more than 50 mm (2 in.)?
YES:
Leakage Test to isolate if
problem is in cylinder or con-
trol valve.
NO:
Free lift drift is OK. Go to
next check.
Operational Diagnostic Procedures
Operational Checkout
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
Confidential/Proprietary - Do Not Copy or Duplicate
9010-05-9
Summary of Contents for A099
Page 1: ...Hyster A276 J45XN J50XN J60XN J70XN Forklift...
Page 14: ...9010 2...
Page 28: ...NOTES 9010 05 14...
Page 30: ...9025 2...
