Graco A Series Repair Manual page 5

WARNING
COMPONENT RUPTURE HAZARD
Do not clean or wipe the piston valve
threads. Cleaning the piston valve
threads could destroy the special sealing
patch and cause the piston valve to come loose
during operation, causing pump bursting and
possible serious bodily injury.
Fig. 6. Unscrew piston valve from piston rod. Clean
and inspect parts. The piston has a special thread
locking/sealing patch. Do not remove the patch. The
patch allows four disassembly/assembly procedures
before it is necessary to apply Loctiter to the threads.
Fig. 6
Fig. 7. Remove packings and glands from piston rod.
Not
used on
248204
253056
255968
Fig. 7
Service
Fig. 8. Remove throat packings and glands from cylin-
der. Discard throat packings and glands.
Not
used on
248204
253056
255968
Fig. 8
Assembling the pump
Fig. 9. Soak all leather packings in SAE 30W oil for 1
hour minimum prior to assembly. Stack male gland
(204) on piston rod. Alternately stack UHMWPE (208)
and leather (218) packings (note orientation) on piston
rod. Install female gland (217). Install piston wiper
(216) (note orientation) and backup washer (229) on
piston valve (210). The special sealing patch on piston
valve threads is good for four repackings. Use Loctiter
on piston valve threads after four repackings.
7576A
Not
used on
248204
253056
255968
Fig. 9
ti3940b
210
218 204 208
310643
7573B
229
216
217
7574d
5