(a) Disassemble as outlined in steps
(b) To clean transfer valve, remove
8-3d(1).
pump tube (1), nut (10) and piston valve
(b) Unscrew cylinder cap (4, fig. 8-
(9); then pull piston assembly off pump rod.
1C) from housing (1). Pull out to expose top
Inspect leather cup (7); replace if damaged
valve spring (7) and top value spring stop
or worn by unscrewing piston nut (8) from
(6). Place large screwdriver in coils of valve
piston (6). Inspect valve and seat if damaged.
spring (7) and pry downward so spring snaps
Polish with fine emery cloth.
off top valve spring stop (6). Valve shifter
(2) To replace seals between tube (1, fig-
rod (8) will then slide out of keyhole slot in
ure 8-2A) and pump adapter (3, figure 8-2B)
top valve spring stop (6) and cylinder cap can
proceed as follows:
be removed. Pull complete air piston assembly
(a) Disassemble as outlined in step
out of air cylinder.
8-3d(1).
(c) Examine packing (2), gasket (80)
and air valve (14). If worn or damaged,
spring stop (4), remove six screws (10, fig.
remove four screws (27) holding trip spring
bearing (29) to air piston (31). Remove
springs (28) and trip spring bearing (29).
remove rod and tube adapter assembly (3
(d) Remove two nuts (11) on bottom
through 8, fig. 8-2B).
end of valve stem (16) then remove washers
Note. Ite may be necessary to loosen cylinder
(18) and air valve (14).
cap and pull out and hold air piston assembly in order
Note. Be sure valve spring (7) is snapped in
to loosen pump rod.
place on top valve spring stop (6). Before replacing
(d) Remove nut (7, fig. 8-2B) from
cylinder cap (4), replace tubs adapter and rod in order
to tighten rod in air piston securely.
pump adapter (3). Remove male packing ring
(e) Grasp valve bar (12) and pull out
(6), four V-packing rings (5), female packing
air piston, remove and replace air valve (14).
ring (4) and O-ring (8). Inspect and replace
damaged or worn parts. Reassemble in reverse
e. Reassembly. Reassembly is essentially the
reverse of disassembly.
order.
(3) To replace O-ring or valves in air
piston, proceed as follows:
and install the low pressure pump.
Section Il. LUBRICATING UNIT PUMPS AND VALVES
(Used on Serial Number 84-29943 thru 84-30304 and 86-30305
thru 8&31248)
8-4. General
Pumps
The air powered pumps are mounted opposite
the hose reel bank assembly, A 40 to 1 ratio
a. Removal. Remove the lubricant pump as
pump is mounted on the center lubricant con-
instructed in paragraph 3-114.
tainer and one 12 to 1 ratio pump is mounted
b. Disassembly.
on each of the two outside lubricant con-
Note. A liquid sealant is applied to the threads of
tainers. The pumps are heavy duty, recipro-
rod (29, fig. 8-3A) to hold nuts (4 and 26) securely.
cating, industrial type pumps. Four control
Special precautions must be observed therefore when
valves are attached to the four lubricant hoses
disassembling and reassembling these parts.
leading from the pumps. The high pressure
(1) Remove plug (1, fig. 8-3A) and insert
control valves are attached to the hose from
assembly (2) with packing (3) from body
the 40 to 1 ratio pump for dispensing grease;
(33).
(2) Unthread four screws (17) and re-
and two low pressure control valves are at-
tached to the hoses from the two 12 to 1 ratio
move adapter (18) with the packing (19) from
valve body.
pumps for dispensing gear and motor oil.
