Graco 16Y598 Operating instructions

333028E
EN
Repair
Displacement Pump
For professional use only.
3300 psi (22.7 MPa, 227 bar) Maximum Working Pressure
Model 16Y598, Series A
UltraMax II and Ultimate MX II 695/795
GMAX II 3900
SL 1250, Mustang 11500
ASM H3150, Storch ST900
Model 16X428, Series A
TexSpray Mark IV
Model 16Y706, Series A
UltraMax II and Ultimate MX II 1095/1595
GMAX II 5900
Model 16X429, Series A
TexSpray Mark V and 5900 HD
TS 1750, ASM H3750, PFT Samba XL
Storch ST 1700/ST 1700+
Model 16Y601, Series A
TexSpray Mark VII
Model 16X423, Series A
GMAX II 7900
Model 16X425, Series A
TexSpray Mark X and 7900HD
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
ti23116a

2333028E
Table of Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 4
Pump Repair Kits . . . . . . . . . . . . . . . . . . . . . . . . 4
Tools Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Cleaning and Inspecting Parts . . . . . . . . . . . . . . 4
Repair When Pump is Separated From Sprayer . 5
Repair When Pump is On Sprayer . . . . . . . . . . . 9
Pump Packings . . . . . . . . . . . . . . . . . . . . . . . . . 14
Parts - Pump 16Y598, 16X428 . . . . . . . . . . . . . . . . 15
Parts - Pump 16Y706, 16X429, 16Y601 . . . . . . . . . 16
Parts - Pump 16X423, 16X425 . . . . . . . . . . . . . . . . 17
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 20

Warnings
333028E 3
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclamation
point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When these
symbols appear in the body of this manual or on warning labels, refer back to these Warnings. Product-specific hazard
symbols and warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNINGWARNINGWARNING
WARNING
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information
about your material, request MSDS from distributor or retailer.
• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment. Alterations or modifications may void agency approvals and
create safety hazards.
• Use equipment only for its intended purpose. Call your distributor for information.
• Do not use 1,1,1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or
fluids containing such solvents.
• Comply with all applicable safety regulations.
MOVING PARTS HAZARD
Moving parts can pinch, cut or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment,
follow the Pressure Relief Procedure and disconnect all power sources.
SKIN INJECTION HAZARD
High-pressure spray is able to inject toxins into the body and cause serious bodily injury. In the event
that injection occurs, get immediate surgical treatment.
• Do not aim the gun at, or spray any person or animal.
• Keep hands and other body parts away from the discharge. For example, do not try to stop leaks
with any part of the body.
• Always use the nozzle tip guard. Do not spray without nozzle tip guard in place.
• Do not leave the unit energized or under pressure while unattended. When the unit is not in use, turn
off the unit and follow the Pressure Relief Procedure for turning off the unit.
• Always engage the trigger lock when not spraying. Verify the trigger lock is functioning properly.

Service
4333028E
Service
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Engage trigger lock.
2. Turn ON/OFF switch to OFF.
3. Unplug power cord.
4. Disengage trigger lock. Hold metal part of gun
against grounded metal pail and trigger gun into pail
to relieve pressure.
5. Engage the trigger lock.
6. Open all fluid drain valves in the system, having a
waste container ready to catch drainage. Leave drain
valve(s) open until you are ready to spray again.
7. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved after follow-
ing the steps above, VERY SLOWLY loosen tip
guard retaining nut or hose end coupling to relieve
pressure gradually, then loosen completely. Clear
hose or tip obstruction.
Pump Repair Kits
Tools Needed
•Vise
• 12 in. adjustable, open-end wrench (2)
• Hammer (20 oz maximum)
• Small screwdriver
• Throat Seal Liquid
• Pick or long small screwdriver
Cleaning and Inspecting Parts
Clean and inspect parts. Pay particular attention to the
ball seats in the intake valve and piston, which must
have no nicks or wear, and to the inside of the sleeve
and the outside of the piston rod, which must not be
worn or scratched. Replace worn or damaged parts.
NOTE:
Remove and clean sleeve when repacking pump.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
Pump Repair Kit
16Y598 248212
16Y706 248213
16X423 249123
16X425 249123 (Stainless steel
check balls);
16X431 (Ceramic check
balls)
16X428 287285 (Stainless steel
check balls);
24V063 (Ceramic check
balls)
16X429 248213 (Stainless steel
check balls);
249189 (Ceramaic check
balls)
16Y601 24M830
COMPONENT RUPTURE HAZARD
To reduce the risk of serious injury from pressurized
fluid, never use sharp or pointed tools to remove
sleeve. If the sleeve cannot be removed easily, return
the sleeve and cylinder to a Graco distributor for
removal.

Service
333028E 5
Repair When Pump is Separated
From Sprayer
Disassembling the Pump
1. Remove packing nut (202) and o-ring (228).
2. Unscrew intake valve from cylinder.
3. Disassemble intake valve. Clean and inspect o-ring
(227).
NOTE: A pick may be required to remove o-ring.
NOTE: Spring (233) only used on 16Y601, 16X423, and
16X425
4. Tap piston rod out of cylinder with a hammer or flip
over and tap piston rod out against a bench.
NOTE: Sleeve may come out of cylinder with piston rod.
5. Remove piston rod from sleeve, or remove sleeve
from cylinder. Mark IV and Mark VII models:
Remove sleeve spacer (230) from sleeve.
ti7566a
228
202
ti7569a
ti7570e
233
215
214
212
213
227
ti23115a
COMPONENT RUPTURE HAZARD
To reduce the risk of serious injury from pressurized
fluid, 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.
ti7571a
ti7572a

Service
6333028E
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

Service
333028E 7
3. Tighten piston valve to piston rod as specified:
4. Soak all leather packings in SAE 30W oil for one
hour minimum prior to assembly. Place male gland
(204) in cylinder. Alternately stack UHMWPE (203)
and leather packings (223) (note orientation). Place
female gland (224) in top of cylinder seat packings.
5. Install seal (201) into packing nut (202). Install
o-ring (228) onto packing nut. Loosely install pack-
ing nut into cylinder.
6. Grease piston packings.
7. Slide piston assembly into bottom of sleeve.
8. Grease top inch or two of piston rod that will go
through the cylinder throat packings.
Models Torque
16Y598, 16X428 27 ± 3 ft-lb.(36.6 ± 4.1 N•m)
16Y706, 16X429,
16Y601
55 ± 3 ft-lb.(74.6 ± 4.1 N•m)
16X423, 16X425 100 ± 5 ft-lb.(136 ± 7 N•m)
ti7576a
ti7573f
203
224
223
204
Not
used on
16Y598,
16X428
ti7581a
201
202
228
NOTICE
Do not slide piston assembly into top of sleeve as this
may damage piston packing.
ti7578c
ti7577a
ti7579a

Service
8333028E
9. Grease o-rings (221) and place on sleeve. Slide
sleeve/piston rod assembly into bottom of cylinder.
Replace o-ring (207) if desired.
NOTE: O-ring (207) is not required for safe pump opera-
tion.
10. Mark IV and Mark VII models: Install o-ring (231)
on sleeve spacer (230) and install sleeve spacer on
sleeve.
11. Reassemble intake valve with new o-ring (227),
seat (212) and ball (214). Seat may be flipped over
and used on other side. Clean seat thoroughly.
NOTE: Spring (233) only used on 16Y601, 16X423, and
16X425.
12. Install intake valve on cylinder. If a wrench is used
torque as follows:
221
207
ti7582a
ti7340a
231
230
Models Torque
16Y598, 16X428 67 ± 5 ft-lb (90.8 ± 6.8 N•m)
16Y706, 16X429,
16Y601
80 ± 5 ft-lb (108.5 ± 6.8 N•m)
16X423, 16X425 200 ± 15 ft-lb (271.2 ± 20.3 N•m)
233
215
214
212
213
227
ti23115a
ti7569a

Service
333028E 9
13. Torque packing nut (202) as follows:
14. Remove o-ring (228) when pump packings begin to
leak after extended use. Then tighten packing nut
down until leakage stops or lessens. This allows
approximately 100 gallons of additional operation
before a repacking is required.
Repair When Pump is On
Sprayer
1. Relieve pressure , page 4.
2. Remove intake valve.
3. Push up retaining spring (26).
Models Torque
16Y598, 16X428, 16Y706, 16Y601,
16X429
100 ± 10 in-lb
(11.3 ± 1.1 N•m)
16X423, 16X425 140 ± 10 in-lb
(15.8 ± 1.1 N•m)
ti7568a
202
228
ti4258c
ti4258a
26

Service
10 333028E
4. Push out pin (29).
5. Disassemble intake valve. Clean and inspect.
O-ring (227) may require a pick for removal.
NOTE: Spring (233) only used on 16Y601, 16X423, and
16X425.
6. Remove piston rod and sleeve.
7. Invert piston rod and sleeve and pound on hard sur-
face until piston rod comes out of sleeve.
Mark IV and Mark VII models: Remove sleeve
spacer from sleeve.
8. Remove packing nut (202).
9. Invert piston rod and insert into cylinder to force out
throat packings.
29
26
ti4258b
233
215
214
212
213
227
ti23115a
ti7746a
ti7572a
202
ti7726a
ti4258e