Broderson IC-20-1J, Operation And Maintenance Manual

Page: 53 / 63

3-17
START-UP PROCEDURE -- PISTON PUMP
When initially starting a new or rebuilt transmission pump, it is extremely important that
the start-up procedure be followed. It prevents damage to the unit that might occur if the
system is not properly purged and charged with oil before start-up.
1. After the propulsion components have been properly installed, fill pump housing at
least half full with new hydraulic fluid as specified on page 3-20. Connect all
hydraulic lines and check to be sure they are tight.
2. Check the wiring connections to the pump control.
3. Fill the reservoir with approved hydraulic fluid that is new and clean. Install a 0 to 300
psi (0 to 21 bar) gauge in the charge pressure port. The port is the highest port on
top of the pump and has a #6 elbow with a 1/4 inch (6 mm) hose that connects with
the brake release valve. This may be disconnected, or a tee may be inserted. See
figure below.
4. Start the engine at the lowest speed and shut it off again after running 5 seconds.
Repeat this twice. This procedure enables the charge pump to draw in the oil before
running the pump continuously.
5. Keep the transmission control in the neutral position, start the engine and run it at a
low idle. The charge pump should immediately pick up oil and fill the system. If there
is no indication of fill in 30 seconds (gauge in charge pressure port of the pump
should register about 220 psi (15 bar)), stop engine and determine the cause.
6. After the system shows signs of filling, run it in neutral and low idle for 5 minutes.
Extend the outriggers so that drive wheels can spin freely. The outriggers must be
blocked up to raise the machine. At low engine speed, slowly push the transmission
lever forward until the wheels turn slowly. Run for 5 minutes and repeat in reverse
direction. Then increase to full throttle for one minute in each direction.
7. Check fluid level in the reservoir and fill to the proper level. Check all line
connections for leaks and tighten if necessary.
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