Graco 16Y598 Repair Manual page 6

Service
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.
Not
used on
16Y598,
16X428
8. Remove throat packings and glands from cylinder.
Discard throat packings and glands.
Not
used on
16Y598,
16X428
6
ti7576a
ti7573b
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.
Not
used on
16Y598,
16X428
2. Install ball (206) in piston rod. If thread sealant is
applied to piston valve threads, make sure that none
gets on ball.
206
ti3940b
ti7575a
210
229
216
217
218 204 208
ti7574d
333028E