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I I n n s s p p e e c c t t i i o o n n a a n n d d M M a a i i n n t t e e n n a a n n c c e e
Brake
1. Check brake linings and components.
2. Check brake operation.
Note: When replacement of brake shoes is indicated, they must be replaced as a pair. Also replace chain at this time.
Throttle Valve Head and Gears
1. Check condition of valve body, valves, and O–Rings on valves.
2. Check condition of gear teeth and bearings.
3. Replace any worn or damaged parts.
Hooks and Suspension
1. Check upper and lower hooks and component parts for bent, worn, cracked, broken or otherwise damaged
parts.
2. On trolley suspended models, check conditions of trolley parts, trolley adapter and component parts. Replace
any damaged parts.
Air Motor
1. Check end faces of rotor for roughness and blade slots for wear or burrs. A new blade should slide in and out of
slots without binding.
2. Check blades for wear, warpage or other damage.
3. Check cylinder bore diameter for rough circular grooves from scoring. A badly scored cylinder cannot be
restored by honing since it will only enlarge bore diameter, widening seal point between rotor and cylinder,
hindering free exhaust of air and result in loss of speed and power.
4. Check end plates for wear or scoring. Check bearings.
5. Replace any excessively worn or damaged parts.
General Maintenance
AIR HOISTS are made of precision parts and should be handled with reasonable care when servicing. Excessive
pressure exerted by a holding device may cause distortion of a part. Apply pressure evenly when disassembling (or
assembling) parts which have a press fit. When removing or installing bearings, apply pressure to the bearing race
that will be press fit to the mating part; if this is not practiced, damage could occur to the bearing. It is important
that the correct tools and fixtures are used when servicing this air hoist.
DISASSEMBLY should be done on a clean work bench with a clean cloth spread to prevent the loss of small parts.
After disassembly is completed, all parts should be thoroughly washed in a clean solvent, blown dry with air and
inspected for wear levels, abuse, and contamination. Double sealed or shielded bearings should never be placed in
solvent unless a good method of re-lubricating the bearing is available. Open bearings may be washed but should
not be allowed to spin while being blown dry. When REPLACEMENT PARTS are necessary, consult drawing
containing part.
BEFORE REASSEMBLING, lubricate parts where required. Use 33153 grease, or equivalent, in bearings. Use
47622327001 lubricant for "O" ring assembly. When assembling "O" rings or parts adjacent "O" rings, care must
be exercised to prevent damage to the rubber sealing surfaces. A small amount of grease will usually hold steel
balls and other small parts in place while assembling.
WHEN ORDERING PARTS, be sure to list PART NUMBER, PART NAME and MODEL NUMBER OF HOIST. USE ONLY
GENUINE ARO REPLACEMENT PARTS.
12
Figure 6. MHP4606
CORRECT
HOOK OPENING
1-1/8" (29 mm) ON 1/4 & 1/2 TON MODELS
(LOWER HOOKS).
1-1/4" (32 mm) ON UPPER & 1-TON
(LOWER HOOKS)
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