Page Number - 11
Form 402006
AIR OPERATEDLUBRICATION UNIT
MODELS 4417, 4459, 4489
BARE PUMP ASSEMBLIES
274216 & 274217
CONTROL VALVE & SWIVEL REPAIR
The control valve and swivel are not serviceable items and disassembly and repair should be limited to replacement of the
grease coupler and nozzle extension. If the control valve or swivel requires service they should be replaced as a unit. Lincoln
does not stock repair parts for the control valve or swivel.
High Humidity Operation
When pump is operated in very humid conditions or when air supply contains high amounts of moisture, the pump may spray
water vapor from the muffler/exhaust with in operation. This vapor may also carry some of the emulsified grease lubricant used
to lubricate the air piston. This is a normal condition and should not be cause for alarm in normal use. In extreme conditions, the
muffler may become blocked with ice or lubricant causing the pump to stop operation. If the muffler is blocked with ice, simply
stop operating the pump and allow the ice to melt. If lubricant from the air cylinder is causing the blockage, simply remove the
muffler and clean with suitable solvent and blow dry with compressed air. It may also be necessary to re-lubricate the air piston,
Item 5, with water resistant #1 grease periodically. Do not operate the pump with out the muffler installed. The muffler is neces-
sary for the proper operation of the pump.
CONDITION
POSSIBLE CAUSE
CORRECTIVE ACTION
Pump does not operate
No air or low air pressure to pump
Make sure air pressure to pump is adequate to
operate pump
Muffler Clogged
Remove muffler and clean or replace.
Pump operates, but does not
deliver lubricant. Pump will not
stall when control valve is closed.
Lubricant reservoir is empty or low on
lubricant.
Refill container
Air pocket present in lubricant
Reposition pump in container or remove air
pocket from lubricant.
Dirt in checks or worn or damaged check
valves (21 & 27)
Disassemble pump and clean or replace check
valves items 21 & 27
Worn or damaged plunger (18)
Disassemble pump and replace plunger (18)
and pump bushing (25)
Pump operates but lubricant is
expelled from exhaust muffler
Water in air or operation in high humidity
conditions.
Install air filter and lubricator in airline to pump
to remove moisture and lubricate pump.
Upper U-cup seal (12) or piston rod (8)
damaged or worn
Repair and replace seal or rod as required.
Air is leaking from exhaust when
pump is stalled
Damaged or worn air piston (5) or piston
seals (4) or air cylinder (2)
Replace damaged components as required.
Broken return springs (7 or 30)
Replace broken springs
TROUBLESHOOTING
To order call 1-800-548-1191 or visit www.partdeal.com - [email protected]
