User's Manual

308345 13
Service
WARNING
MOVING PARTS HAZARD
To reduce the risk of serious injury,
including cuts, amputation of fingers,
and splashing in the eyes or on the skin
 Always shut off the mixer and disconnect the air
line before you check or repair the mixer.
 Wear eye protection.
WARNING
FIRE AND EXPLOSION HAZARD
To prevent an explosive hazard, in which
injury and/or property damage can result
 Do not operate the air motor with combustible
gases.
 Do not use kerosene or other flammable
solvents for flushing.
WARNING
HAZARDOUS FLUIDS
Keep your face away from the exhaust
port. Foreign material exiting the air
motor can be hazardous.
Flushing Instructions
If the motor is sluggish or inefficient, flush it with non-
flammable solvent in a well-ventilated area.
The recommended solvent for air motors and lubri-
cated pumps is Gast flushing solvent (Part No.
AH255 or AH255A) or Inhibisol Safety Solvent.
1. Disconnect the air line and muffler.
2. Dump or spray several teaspoons of solvent
directly into the motor.
3. Rotate the shaft by hand in both directions for a
few minutes.
4. Reconnect the air line, and slowly increase air
pressure until there is no trace of solvent in the
exhaust air.
5. Re-lubricate the motor with a squirt of light-weight
oil in the chamber.
Servicing Guidelines
NOTE: If the motor does not operate properly after
flushing, order and install the repair kit for your air
motor. The instructions for servicing the air motor are
included with the kit. See page 17 to order the kit.
 If the mixer requires more than installation of a
service kit, it is usually quickest and easiest to send
it to the Graco distributor for repair or replacement.
 If the vanes need replacing or foreign material is
present in the motor chamber, an experienced
mechanic may remove the end plate opposite the
drive shaft end. Do not pry with a screwdriver. It will
dent the surface of the plate and body and cause
leaks. Use a puller tool, which will remove the end
plate while maintaining the position of the shaft.
 New vanes should have the edges with cut corners
(or the notched edges, if the vanes are reversible)
pointing toward the bottom of the vane slot.