Paragraphs 329-331
ALLIS-CHALMERS
9.
Cylinder
10.
Snap ring
11.
Bushings
12.
Plunger guide
13.
Gland packing
14.
Packing gland nut
15.
Plunger
21.
Bushing spacer
13
11
Pig. ACI7f—Model G hydraulic pump and
belt pulley drive unit when viewed from
the mounting pad side.
closed end cages as shown at (19). To
insure against fluid leakage each
closed end bearing cage should be
lightly coated with an approved gas-
ket cement when it is being installed.
Refer to Fig. AC170.
Pump relief valves and control valve
are mounted in top of pump body as
shown. Do not remove ball seat (48)
unless it is known to be defective. A
leaking valve can often be corrected
by striking a new ball (49) against
the seat using a one pound hammer
and a soft drift. Relief valve spring
(36) has a free length of 3 13/16. The
screw (44) and spring (43) in con-
trol cover is used to adjust the rate
of implement drop. If it is turned
clockwise, the drop rate is decreased.
A valve in the remote ram line ad-
justs the amount of delayed lift of the
rear furrowing bar.
When tested with a pressure gauge,
the pump relief valye should unload
at 900 psi.
To overhaul the pump drive shaft,
(7),
which also drives the belt pulley
refer to paragraph 309B.
HYDRAULIC RAMS
329.
Method of removal and disas-
sembly of these units, Figs. AC173,
AC174, and AC176 is self evident. On
some models the ram plungers act
simply as elements to displace the
fluid, and therefore, they are consid-
erably smaller in diameter than the
bore of the unmachined cylinders in
which they operate. It is advisable to
renew *'O" or chevron packings when-
ever a unit is disassembled. On mod-
els having chevron type packings the
packing should be installed with the
open end of the **V" towards the oil
supply. Reject any plungers on which
Fig, ACT73—Mode/ CA remofe hydraulic ram—exploded view. Install plunger gland
packing (13) so that the chevron ring lips face toward the pressure.
•3
23
22
1.
Lift arms
and
shaft
3.
Shaft support
8.
Lift shaft hushing
10.
Snap rinir
12.
Plunger guide
13.
Packing
14.
Plunger guide nut
16.
Plunger
22.
L.
H.
ram tee
23.
L. H. ram tube
Fig, ACI74-Modef CA hydraulic power lift rams (cylinders) and lift (rock) shaft. Bleed
hydraulic system by loosening packing gland nut
(14)
when the rams are fully extended.
the seal contacting surfaces are
scratched or scored. Rams and cylin-
ders must be bled to remove all air
from hydraulic system after they have
been installed.
HYDRAULIC SYSTEM LINKAGE
Because of the draft control char-
acteristics of the hydraulic system on
models CA, WD, and WD45, it is im-
portant that the system linkage be
correctly adjusted as outlined in para-
graphs 330 through 336.
Model CA
330.
PUMP REGULATING SPRING.
The recommneded adjustment is ap-
proximately 3/16 of an inch of pre-
load as shown in Fig. AC177. This can
be obtained by backing off the nut
(11) until spring is just free endwise,
then tightening the nut until the
spring has been shortened 3/16 inch
which is the equivalent of 3 complete
revolutions of the nut.
331.
DRAWBAR LINKAGE. This
linkage, Fig. AC178, is correctly ad-
justed when with zero load on the
drawbar and drawbar clamp loose
there is no clearance at (4) and 1/32
inch clearance at (X) when hand
control lever is in raised position.
94
To Next Page
Loading...
