Maintenance And Repair - Graco 218334 Instructions Manual

Maintenance and Repair

Maintenance and Repair
Never operate the pump with the air motor shield
removed. The shield encloses the air valve housing,
which moves during operating and can pinch or
amputate your fingers.
Throat Packing Nut
1. Relieve pressure following pressure relief proce-
dure (page 7).
2. Check tightness of throat packing nut, weekly. The
nut should be tight enough to prevent leakage - no
tighter.
Locating Air Leaks
Air leaks can generally be detected by listening when
the pump is not running. To locate where the air is leak-
ing:
1. Turn off air supply.
2. Relieve pressure, page 7.
3. Disconnect the air hose.
4. Screw the inlet union (117) out of the manifold (87).
5. Remove the air motor shield (73) and screw the inlet
union (117) back into the manifold (87).
6. Connect the air hose and turn the air on. DO NOT
EXCEED 40 psi (2.8 bar, 0.28 MPa) inbound pres-
sure.
7. Use the checking methods listed in the Air Leak
Check Chart to find where the air is leaking.
Replace parts as necessary.
8
Air Leak Check Chart
Stroke Check Points
Position (F . 3)
IG
A - air manifold
B - between
Down cylinder and base
C - weep hole
D - trip rod
Up
E - air director
valves
Both F - exhaust holes
F
E
F . 3
IG
Checking
Cause
Method
Blown air manifold
By feel
gasket (91)
Blown air cylinder
By feel
gasket (103)
Blown base bear-
By feel ings, upper o-ring or
cup seal
Squirt oil Worn trip rod pack-
around bearing ing (71) or bearing
(98) (98)
Squire oil Worn air valve (92)
around air or their packings
valves (92) (93)
Hold paper strip
Worn air piston
over exhaust
o-ring (69)
holes
C
B
307714E
A
D