Graco 218334, Instructions Manual

Page: 8 / 20

Maintenance and Repair
8 307714E
Maintenance and Repair
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.
Air Leak Check Chart
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.
Stroke
Position Check Points
(F
IG
. 3)
Checking
Method
Cause
Down
A - air manifold By feel
Blown air manifold
gasket (91)
B - between
cylinder and base
By feel
Blown air cylinder
gasket (103)
C - weep hole By feel
Blown base bear-
ings, upper o-ring or
cup seal
Up
D - trip rod
Squirt oil
around bearing
(98) Worn trip rod pack-
ing (71) or bearing
(98)
E - air director
valves
Squire oil
around air
valves (92) Worn air valve (92)
or their packings
(93)
Both F - exhaust holes
Hold paper strip
over exhaust
holes
Worn air piston
o-ring (69)
F
IG
. 3
F
A
D
C
B
E