Allis Chalmers Models 8010, 8030, 8050, 8070 Shop Manual

Paragraphs 1 1 5-1 1 6
e. Inching spool not moving rear-
ward.
f. Transmission input shaft failure.
g. Differential or final drive failure.
2.
Tractor does not move when clutch
is engaged - engine does not pull
down - transmission lube pressure
warning light on. Could be caused
by:
a. Low oil level in transmission.
Check for oil transfer to rear
housing.
b. Pressure leak between gerotor
pump and rear housing.
c. Plugged gerotor pump intake
screen causing cavitation.
d. Gerotor pump failure.
e. Oil leak in low range clutch.
3.
Tractor does not move when clutch
is engaged - engine
pulls down.
Could be caused by:
a. Accumulator piston stuck
in
"Power Director" valve causing
both high and low clutches to be
engaged at same time.
b. Transmission brake pressurized
or plates warped.
c. Solenoid shifting valve "O" rings
failed causing pressurization of
both accumulator pistons.
d. Transmission input shafts seized
together.
e. Gear seized to
mainshaft in
"Power Director" transmission.
f. Gear seized to pinion shaft in
range transmission.
4.
Tractor will not stop when clutch is
disengaged. Could be caused by:
a. Plugged drain orifice in high
range clutch.
b. Warped clutch plates or clutch
plates hanging on splines.
c. Inching spool not moving for-
ward.
5.
Transmission brake ineffective
causing gear clash when shifting.
Could be caused by:
46
a. Warped
or hanging clutch
plates.
b. Transmission brake
control
linkage out of adjustment or
defective.
c. Pin out of brake piston.
d. Brake disc excessively worn.
6.
Jerky clutch engagement. Could be
caused by:
a. Inching spool sticking or inching
spring broken.
b. Pressure regulating valve spool
sticking.
c. Cross drilling to center passage
in inching spool plugged.
d. Clutch control linkage damaged
or worn.
7.
Clutch slips under load. Could be
caused by:
a. Low
clutch
pressure.
Check
pressure regulating valve.
b. Pressure leak in clutch unit.
c. Torque limiter failure.
d. Warped
or hanging
clutch
plates.
8.
Tractor hesitates on low to high
shift. Could be caused by:
a. Warped high range clutch plates.
b. Leak in high range clutch.
c. High range accumulator inlet
orifice plugged.
d. Low clutch pressure.
e. Torque limiter slipping.
9.
"Power Director" will not shift from
low to high range - engine pulls
down. Could be caused by:
a. Low range accumulator piston
or selector spool stuck prevent-
ing disengagement of low range
clutch.
b. Low range restrictor assembly
plugged.
c. Warped or hanging low range
clutch plates.
10.
"Power Director" will not shift from
low to high range - engine does not
pull down. Could be caused by:
a. Electrical malfunction in shift
control.
b. Solenoid or valve spool stuck in
low range position.
11. Tractor stops when shifted to high
range. Could be caused by:
a. Shifting spool sticking in mid-
position (neutral) causing both
clutches to disengage.
b. Broken high range input shaft.
Fig.
93-
View showing in·
sta/lation
of
flow
meter
hoses
to
check
gerotor
pump flow.
I. Supply line from pump
2. Adapter
3. Flow meter inlet hose
4. Elbow
5. Adapter
6. "Power Director" valve
inlet port
7. Flow meter outlet hose
ALLIS-CHALMERS
12. Engine pulls down when "Power
Director" is shifted from high to low
range. Could be caused by:
a. Plugged drain orifice in high
range piston housing preventing
high range clutch from releasing.
b. High range accumulator piston
or selector spool stuck in engag-
ed position.
c. High range accumulator orifice
plugged.
13. "Power Director" clutch shifts into
high range when clutch pedal is
released. Could be caused by:
a. Shifting spool stuck in high
range.
b. Defective shifting toggle switch
or relay.
14. "Power Director" clutch does not
return to low range when clutch
pedal is depressed. Could be caused
by:
a. Defective kickdown switch.
b. Shifting spool sticking or return
spring broken.
TESTING
All Models So Equipped
The "Power Director" transmission
circuit is supplied oil from the gerotor
pump. The circuit operates the "Power
Director" clutch and transmission brake
and lubricates transmission and "Power
Director" clutch. Before testing, operate
tractor until hydraulic oil is at normal
operating temperature, approximately
160
°
F (70
°
C).
115. GEROTOR PUMP.
To
test
gerotor pump, a suitable flow meter,
such as ACTP-1008, must be used.
Disconnect oil supply hose (1 - Fig. 93)
from pump at the "Power Director"
valve and connect flow meter inlet hose
(3) to pump supply hose. Connect flow
meter outlet hose
(7)
to
"Power
Director" valve inlet port (6).
CAUTION: Make certain that flow meter
restrictor valve is completely open before
starting engine as there is no relief valve
protection for pump with flow meter con·
nected in this manner.
With engine speed set at 2300 rpm,
gerotor pump should produce a mini-
mum of 13.6 gpm (51.5 liter/min.) flow
at 200 psi (1380 kPa) pressure. At 1000
rpm, 2.5 gpm (9.46 liter/min.) minimum
flow should be obtained at 200 psi (1380
kPa). If pump output is less than
minimum specifications, pump should be
repaired or renewed.
1 1 6 . RE GULATING
VALVE
PRESSURE.
To test regulating valve
pressure, install a 600 psi (4000 kPa)