Hunter L451 - Page 26

MAINTE-
NANCE
SCHED-
ULE
PERFORM THE FOLLOWING MAINTENANCE
Monthly Check wire ropes for damage and lubricate with a thin oil (SAE 5W-30). Note: Do not use used motor
oils. They contain contaminants that will break down factory applied lubricants. Also, do not use oils
containing a solvent base (solvent cutback oils). They also will break down factory applied lubricants.
Replace wire ropes immediately if any sign of wire rope damage is found. Inspect enre li for loose,
damaged, or broken bolts. Replace as necessary. Blow dirt from insides of slide plates with compressed
air (do not grease). Swing Air/Power Jacks: Clean swing air jacks thoroughly with a degreasing solvent
and dry. Wipe cylinder tubes with oil. Apply SAE 30 oil to rollers and pivot pins. Clean both rams
and apply SAE 30 Oil (see gure below). Check proper operaon of control levers. Verify two handed
operaon of raise/lower controls. Check for air leak. Check that the locks are fully engaging and
unlocking at the correct mes. Check that pivot lock pins are undamaged and lock and unlock freely.
Verify that counter balance spring is funconal. Perform general structural check for damage. Check
columns and runways for corrosion. Corrosive agents, solvents, and road salts can greatly reduce the
life of the li in a very short period of me. If these types of agents are spilled or splashed onto the
li, immediately rinse area thoroughly with water. If they come in contact with the wire ropes, wash
the wire ropes immediately with water and re-lubricate with low viscosity oil. Check the power unit
reservoir oil level. Add oil if necessary (use Hunter’s specially ltered DEXRON III transmission uid,
148-128-2). NOTE: Oil must be checked and lled when the lift is in its fully lowered position. Remove
air breather cap and oil full level screw located at the top of the reservoir. Fill reservoir with oil unl the
oil begins to drip from full level screw hole. Replace air breather cap and oil full level screw. If the oil
level is found to be low, determine the source of the oil loss and repair immediately. Apply SAE 30 oil to
all pivot pins, ramp pins, wheel stop pins and leg shas. Wipe hoist cylinder with oily cloth and lubricate
gear rack. Notes about corrosion: The best prevenve maintenance against wire rope corrosion is to
keep the wire ropes well lubricated. The oil prevents moisture from entering into the wire rope strands.
Once salt and moisture have penetrated into the core of the wire rope it is very dicult to displace and
corrosion will begin immediately. Remove top slip plate. Clean thoroughly with a degreasing solvent and
dry. Coat unpainted surfaces, where balls roll, with paran. Replace any broken balls. Replace top plate.
Apply SAE 30 Oil to jack linkage pins and levers (see gure below).
Every Six
Months
Check runways and re−level as required. . Store personnel should not adjust any rack level legs. Apply
SAE 70 grease to grease ngs on swing air jack cylinders with jack fully extended. NOTE: Do not
over−grease; two shots is sufcient.
Annually The enre li should be inspected yearly (more frequently for severe use applicaons) by your factory
authorized service representave. Apply 3 shots of Moly-Grease to each ng on both sides of the jack
channel assembly (see gure below). Apply 1-2 shots of Moly-Grease to each ng on both sides of the
lower cylinder assembly with jack fully extended (see gure below). Composite cylinders without grease
ngs do not require annual lubricaon.
Every
Two
Years
Change hydraulic uid. Use 4 gallons (15 liters) of Hunter’s specially ltered DEXRON III transmission
uid, 148-128-2. NOTE: Oil must be lled when the lift is in its fully lowered position. Drain uid from
reservoir by dropping pump reservoir with the lift lowered completely. Clean any metal parcles that
may be on the magnet.
Every Six
Years
Hunter Engineering requires that the liing cables on all 4-Post models be replaced every six years.
Hunter Service representaves are authorized to perform this service.
4-Post Lift Rack Models L451 & 454 Operations Manual
Page 26 of 28