Graco Therm-O-Flow 200 Instructions - Parts Manual page 112

Repair
7. Remove guide sleeve (135) and slide it off piston
rod (132).
Do not tilt the piston rod to one side when removing it
from the base or when installing it. Such movement
can damage the piston or inside surface of the base
cylinder.
8. Carefully lay piston (141) and rod (132) down so rod
will not be bent. Remove bottom retaining ring (138)
and o-ring (139). Remove piston guide band (140).
Slide piston (141) off piston rod (132).
139
137
141
140
F . 49: 6.5 in. Ram Piston
IG
Assemble Ram Piston
1. Install new o-rings (139, 137) on piston rod (132)
and piston (141). Lubricate the piston (141) and
o-rings (139, 137). Reinstall piston (141) and lower
retaining ring (138) onto piston rod (132). Install pis-
ton guide band (140) onto piston (141).
2. Carefully insert piston (141) into cylinder and push
rod (132) straight down into cylinder. Add three
ounces of lubricant to each cylinder after inserting
the piston (141).
3. Slide guide sleeve (135) onto piston rod (132).
4. Install retaining ring (134) and tie bar (219). Perform
steps to Disassemble Ram Piston in reverse
order.
112
NOTICE
132
138
TI10785A
D200 and D60 3 in. Ram Piston Rods
Always service both cylinders at the same time. When
you service the piston rod always install new o-rings in
the piston rod seal and Ram piston.
Disassemble Piston Rod Seal and Bearing
1. Follow the Pressure Relief Procedure on page 46.
2. Access piston rod seal and bearing.
a. For D200 3 in. Ram: Remove nuts (125) and
lockwashers (124) holding the tie bar (219) to
the piston rods (246). Remove nuts (403, 405)
and washers (402, 404). Remove tie bar (219).
Refer to parts illustrations on page 119 and 123.
b. For D60 3 in. Ram: Ensure Ram Assembly (A)
is in lowest position. Remove nuts (125) and
lockwashers (254) from piston rods (261).
Remove entire Pump, including the mounting
plate (259) off of the piston rods (261). Secure
the Pump so the Pump (C) and Platen (D) will
not fall. See page 124.
3. Remove retaining ring (218).
4. Remove piston rod seal and bearing.
a. Slide end cap (242), pin (238), o-ring (245), and
spring (244) up off of the piston rod (261, 246).
Remove retaining ring (241) and bearing (243)
from end cap (242) and remove o-ring (240).
5. Inspect parts for wear or damage. Replace as nec-
essary.
NOTE: Do not reinstall end cap assembly if the Ram
piston (247) needs to be removed from the piston rod.
See the next page for Ram piston repair instructions.
3A8005A