Technical data

Repair
312185S 15
Reassembly
Air Cylinder Section
1. Lubricate the shaft o-rings (23) and the bearings (7).
Insert o-rings into the air cylinder (2) and air cap
(22) cavities.See F
IG. 6.
2. 255179 and 255182 only: Insert the snuff-back
adjustment knob (21) in the cap (22). Tighten the
screw (24) on the end of the snuff-back adjustment
knob (21). Torque to 25-30 in.-lb (2.8-3.4 N•m).
3. Press the bearings (7) flush into the air cylinder
housing (2) and air cap (22), trapping the o-rings
(23).
4. Lubricate and reassemble the piston assembly: pis-
ton (9), o-ring (6), dowel pin (8), nuts (3), o-ring (4),
and air cylinder shafts (5). Tighten nuts (3) to 25-30
in-lb (2.8-3.4 N•m). The shafts (5) should hang with
some play to be self-aligning in the bearing.
5. Lubricate the air cylinder (2) ID. Push the piston (9)
assembly into the air cylinder.
6. Lubricate and assemble the o-ring (6) onto cap (22).
Push cap (22) into cylinder (2).
7. Install the outside retaining ring (1).
Fluid Section
1. Lubricate the bearings (11), o-rings (13, 36) and
seals (12, 15). Put the o-rings (13, 36) on the bear-
ings. Carefully insert the seals (12) into the bearing
recess, with the lips of the seals facing into the bear-
ing. Insert the seals (15) into the bearing with the
spring facing out of the housing. Be careful not to
damage the seal lips. See F
IG. 5.
2. Push the bearings (11) into the air cylinder (2).
3. Grease the fluid housing (14) and install over the
bearings (11). Install the clamps (17) and screws
(18). Tighten to 25-30 in-lb (2.8-3.4 N•m).
4. For 255180 and 255182, insert the gaskets (28) and
seats (27).
5. Screw in the needle (25) and tighten it to 25-30 in.-lb
(2.8-3.4 N•m). See F
IG. 4.
6. 255179 and 255181, Insert the seals (26) with the
springs facing into the fluid housing (14).
7. With the “X” on the nosepiece on the same side as
the “MD2” on the air cylinder, install the nosepiece
(31) with the o-rings (20), seats (27), and nosepiece
screws (19). Tighten the nosepiece screws to
115-120 in-lb (14-15 N•m).
8. 255181 and 255182, Install injector tube (30) with
assembly tool (48). Torque to 168-192 in-lb
(19.0-21.7 N•m).
9. 255181 and 255182, Install injector tip (47) and
torque to 60-72 in-lb (6.8-8.1 N•m).
10. Remove zerk grease fitting (39). Fill grease in the
grease port below until grease begins to exit where
the zerk grease fitting (39) was located. Repeat for
the other zerk grease fitting (39). See F
IG. 6.
Pneumatic Handle (if equipped)
1. Liberally lubricate o-rings (203) and reassemble.
Install spool (202) and spring (213). Torque plug
(211) to 125-135 in-lb (14-15 N•m). See F
IG. 7.
2. Align the gasket (204) and dispense valve on the
top of the handle (205). Torque the four screws
(214) evenly to 15-20 in-lb (1.7-2.2 N•m).
Electric Switch Handle (if equipped)
1. Install the plunger (113) and spring (116). See FIG.
8.
2. Insert the switch assembly (255463) while routing
the ground lug (108) through the hole in the top of
the handle.
3. Torque plug (111) to 125-135 in-lb (14-15 N•m).
4. Tighten the strain relief (112).
5. Install the ground screw (110) through the lock
washer (109) and ground lug (108). Torque to 15-20
in-lb (1.7-2.2 N•m).
6. Align the dispense valve on the top of the handle
(101). Torque the four screws (120) evenly to 15-20
lb (1.7-2.2 N•m).
NOTE: The snuff-back adjustment knob (21),
shaft o-rings (23), and screw (24) are not pres-
ent in models 255180, 255182, and 255183.