Paragraph 324 Cont.
ALLIS-CHALMERS
at right ram. Remove control hous-
ing-to-pump retaining cap screws and
remove assembly. Remove pump-to-
torque tube retaining bolts and nuts.
Partially compress the pump cam fol-
lowers and lift pump straight up.
After installing the unit, it will
be necessary to bleed the system of
air. Operate the pump and with both
rams extended, loosen both ram pack-
ing gland nuts until a solid flow of oil
is forced past the packing. Retighten
packing gland nuts finger tight.
To remove pump cam shaft which
on the CA is integral with the pto shaft
refer to paragraphs 311 and 312. To re-
move camshaft which on the WD and
WD45 is integral with the engine
clutch shaft refer to paragraph 192.
CAM FOLLOWERS & PUMP
PLUNGERS. After removing the
pump, remove pivot pin to release
cam follower and roller assemblies
and pump plungers. Cam followers are
available only as a complete assem-
bly. Check outer surface of springs for
wear and all over for rusting or cor-
roded spots. Renew any doubtful
springs.
HOLD POSITION VALVE. To dis-
assemble the removed valve unit Fig.
AC165,
remove the snap ring (25)
from camshaft (35), turn shaft to
^'lowering" position and withdraw
shaft from body. Do not remove ball
seat (31) unless it is known to be de-
fective. If seat must be removed drill
and tap same for a screw puller.
With adjusting screw (C) turned all
the way, valve should unseat at 875 to
975 pounds pressure. If valve leaks, try
seating a new ball (1) to same by
striking the ball a heavy solid blow
using a one pound hammer and a soft
drift interposed between ball and
hammer. If necessary to install a new
seat (31) reseat in same manner after
seat insert has been assembled to
valve body. If valve does not leak but
releases at too low or too high a pres-
sure vary the number of shims (W)
to obtain desired 875-975 unseating
pressure.
The point where valve body (30)
is joined to pump body is sealed by an
R
1 2
IS
!3
fig.
ACT64-Model WD power lift hydraulic
A. Draft regrulating lock-out screw
B.
Control lever lock screw
C. Control valve adjusting screw
D.
Volume control adjusting screw
P.
Pump pistons
R. Right ram pressure connection
W. Hold position valve spring shims
X. Unloading valve spring shims
pump which Is o# the four plunger type. Pump Is mounted on right side of torque tube.
Models
CA
and WD4S are similar.
1.
Hold position valve ball
2.
Hold position valve plunger
3.
Control rod (pump)
4.
Control rod (hand)
5.
Check valve
6. Lowering control valve sleeve
7.
Lowering control valve
8. Valve lever
9. Control shaft
11.
Unloading valve piston
12.
Pump pistons
13.
Oil inlet
14.
Cam followers
15.
Unloading valve plunger
16.
Unloading valve ball
17.
Unloading valve assembly
18.
Control valve sleeves
19.
Control valve plunger
20.
Discharge valve
21.
Pressure manifold
90
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