Graco 239729 User Manual

Page of 18
Repair
308777L
11
6.
Use a screw driver to push down on the trip rod 
yoke (14) and snap the toggle assemblies (K) down. 
See F
. 5. Remove the lock wires (28) from the 
adjusting nuts (27) of the transfer valves (M). Screw 
the top adjusting nuts (27) off. Screw the valve 
stems (30) out of the grommets (18) and lower 
adjusting nuts (27). Take the valve poppets (37) off 
the stems and squeeze them firmly to check for 
cracks.
7.
Grip the toggle rockers (16) with a pliers. Compress 
the springs (17) and swing the toggle assembly (K) 
up and away from the piston lugs (L), and remove 
the parts. Check that the valve actuator (13) is sup-
ported by the spring clips (4), but slides easily into 
them. (F
8.
Remove the trip rod yoke (14), valve actuator (13) 
and trip rod (1). Check the exhaust valve poppets 
(38) for cracks.
NOTE: To remove the exhaust valve poppets (38), 
stretch them out and cut with a sharp knife.
9.
Pull the piston (5) up out of the base (56) and 
inspect the piston o-ring (20) and the o-ring in the 
base casting.
Reassembly
1.
Clean all the parts carefully in a compatible solvent 
and inspect for wear or damage. Use all the repair 
kit parts during reassembly and replace other parts 
as necessary.
2.
Check the polished surfaces of the piston, piston rod 
and cylinder wall for scratches or wear. A scored rod 
will cause premature packing wear and leaking.
3.
Lubricate all parts with a light, water-resistant 
grease.
4.
Be sure the o-rings re in place. Slide the piston rod 
down through the throat bearing and lower the pis-
ton (5) into the air motor base (56).
5.
Pull the exhaust valve poppets (38) into the valve 
actuators (13) and clip off the top part shown with 
dotted lines. (F
6.
Install the transfer valve poppets (37) onto the valve 
stems (30), bottom adjusting nuts (27), grommets 
(18), and top adjusting nuts (27) on the piston (5). 
Assemble the trip rod (1), valve actuator (13), trip 
rod yoke (14, and toggle assemblies (K) on the pis-
ton. (F
F
IG
. 5
K
Push toggles (K) in 
and then up.
Turn wires up.
L
1
14
28*
27*
30*
18*
5
56
17
16
4
38*
13
27*
37*
C
ut off tops of
poppets (x) as 
indicated by dotted
lines
0.125 in. 
(3.18 mm)
CUTAWAY VIEW
1
4
13
38*
30*
27*
18*
27*
20*
5
37*
M