Almaco SPC 20 - Hydraulic Systems

SPC 20 OPERATOR’S MANUAL
E-8 MAINTENANCE
HYDRAULIC SYSTEM
The ALMACO SPC-20 Combine utilizes hydraulic systems to provide power to the components
used for threshing, ground drive, steering, header lift, and various options.
Power is supplied directly by a Duetz 73 hp air-cooled diesel engine, which drives two variable
displacement pumps and one fixed displacement auxiliary gear pump. The first (closest to the
engine) pump supplies power to the ground drive and is controlled by the forward reverse control
lever. The second (middle) pump supplies hydraulic fluid, through a racine valve, to the threshing
cylinder motor, and header motor(s). The third pump powers: hydraulic power steering, header lift,
transfer auger motor, unload auger motor, and transfer auger fold through a BA valve and solenoid
bank.
HYDRAULIC RELIEF VALVES
NOTE: All hydraulic relief valves are pre-set at the factory. Check with ALMACO before
making any adjustments.
RECOMMENDED HYDRAULIC RELIEF OIL PRESSURE SETTINGS:
a. Threshing cylinder: 5000 psi
b. Ground drive: 5000 psi
c. Auxiliary pump: 2500 psi
d. Header: 2000 psi standard head - 4500 psi corn or row crop
HYDRAULIC OIL VACUUM GAUGE:
Gauges the vacuum suction that is required to draw the oil into the charge pump. Normal operating
vacuum level should be between 1" – 2" of mercury. Vacuum rising above 5" of mercury exceeds
manufacturer's recommendation. Excess vacuum may be due to a clogged suction filter or blocked
suction lines. If it is cold outside and the hydraulic oil is cold the vacuum may be above 5" of
mercury until the hydraulic oil warms up.
HYDRAULIC OIL COOLING FAN:
A temperature switch turns on an electric cooling fan which runs when the hydraulic oil temperature
exceeds 141
o
F (60
o
C). If the oil temperature is above 141
o
F and if the fan is not running, turn off the
engine and trouble shoot the electrical system as follows:
1. With the ignition key on, use a 12-volt test light to see if power is being supplied to the
temperature switch on the red/white wire.
2. Check the relay with the test light to determine whether the relay is closed below 141°F. If
there is power at the 87A terminal, the motor may be bad. Replace relay if there is not power
at the #87A terminal.
3. Test the temperature switch with the test light to determine whether the switch closes at
around 141
o
F. If there is no power at the red/gray wire replace the temperature switch.
4. Use test light on white or blue fan wire and ground or at terminal #87 on the relay, when the
temperature reaches 141°F this location should be powered. Check the ground on the motor,
otherwise the motor is bad.