Graco 16X423, Repair Manual

Page: 6 / 20

Service
6 333028E
6. Unscrew piston valve from piston rod. Clean and
inspect parts. The piston has a special thread lock-
ing/sealing patch. Do not remove the patch. The
patch allows four disassembly/assembly procedures
before it is necessary to apply thread sealant to the
threads.
7. Remove packings and glands from piston rod.
8. Remove throat packings and glands from cylinder.
Discard throat packings and glands.
Assembling the Pump
1. 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, threads are good for four repackings.
Use thread sealant on piston valve threads after
four repackings.
2. Install ball (206) in piston rod. If thread sealant is
applied to piston valve threads, make sure that none
gets on ball.
ti7576a
ti3940b
Not
used on
16Y598,
16X428
ti7573b
Not
used on
16Y598,
16X428
216
218 208 204
217
210
229
ti7574d
Not
used on
16Y598,
16X428
ti7575a
206