Graco 221-181 Instructions-Parts List

INSTRUCTIONS–PARTS LIST
CONVERSION/REPAIR KIT 221–181
To repair Quiet Viscount I Hydraulic Motor, Model 221–168
To convert a Standard Viscount motor, Models 210–107,
217–022 and 217–338 to a Quiet–style motor.
U.S. Patent No. 4,792,291
U.K. Patent No. 2,226,089
French Patent No. 88 16726
Other Foreign Patents Pending
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including
fluid injection, splashing in the eyes or skin, or injury
from moving parts, always follow this procedure
when shutting off the pump, checking or servicing
any part of the system, installing or changing spray
tips and whenever you stop spraying.
1. Engage the gun/dispensing valve safety latch.
2. Turn off the hydraulic power supply.
3. Disengage the gun/valve safety latch.
4. Hold a metal part of gun/valve firmly to a
grounded metal pail. Trigger to relieve pressure.
5. Engage the safety latch again.
6. Open the pump drain valve (required in system),
having a container ready to catch the drainage.
7. Leave the drain valve open until you are ready to
spray again.
If you suspect the spray tip or hose is completely
clogged or pressure is not fully relieved after follow -
ing these steps, VERY SLOWLY loosen hose end
coupling and relieve pressure gradually, then loosen
completely. Now clear the tip or hose obstruction.
CAUTION
Cleanliness is essential when repairing hydraulic mo-
tors. Avoid getting dust or dirt into the motor.
NOTE: Complete warnings and instructions are in
manuals 307–158 and 307–865.
NOTE: Always replace retaining plugs and springs
when replacing spool. Kit parts are marked in the
text with two asterisks, for example (37**).
Disassembly
1. Follow the Pressure Relief Procedure Warning.
Disconnect all lines from motor. Remove pump from
mounting. Disconnect motor from pump.
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
This manual contains IMPORTANT
WARNINGS AND INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
COPYRIGHT 1987, GRACO INC.
CAUTION
Plug the hydraulic lines immediately to prevent con-
tamination of the hydraulic system.
2. Place the hydraulic motor in a bench vise.
3. For Models 221–168 and 210–107 only: Remove
the drip pan screws (4) and drip pan (50) from base
(42). Unscrew the retainer screw (6). Remove the
drip cover (31) from the piston (49). Refer to the Parts
Drawing on page 3.
4. Unscrew both hydraulic tube (48) compression nuts.
Remove the tube. Drain the oil into a pan. Remove
the screws (8) holding the end cap (44).
5. Push the piston (49) up as far as possible.
CAUTION
To prevent damage to the spool (37) and upper hous-
ing (40), be sure the detent assemblies are removed
before removing the end cap (44) and bearing and
guide (51). See Step 6.
6. Remove one detent assembly – plug (28), gasket
(25), spring (29), guide (27), ball (7) . If parts stick in
the upper housing (40), turn the motor over and tap
lightly. Do not allow the parts to fall into the motor.
Repeat for the other detent assembly.
7. Loosen the four tie rod locknuts (3).
8. Remove the motor and lay on its side in a pan.
9. Remove the four tie rod locknuts (3), the four tie rods
(35) and washers (1). It is not necessary to remove
the crown nuts (22) from the rod.
CAUTION
With the tie rods removed, the assembly may sepa-
rate at the joints between the cylinder (39) and the
upper and lower housings (40 & 41).
10. Remove the capscrews (8) and end cap (44).
307–866
Rev. B
Supersedes A