CASE IH agriculture 7120-9120 series axial-flow combine bleeding service break operation guide.
The European machines may be equipped with a pressure limiting valve to prevent the main drive wheels from locking up. The valve incorporates a solenoid L-32 that when activated will expose the brake pressure lines to a relief.
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Any time the brake is disassembled or lines removed, the system will require bleeding. To bleed the system proceed as follows:
REMEMBER: As the brake pedal must be depressed several times while bleeding,this job has to be done with two persons.
Procedures:
1 Park the combine on level ground and block the wheels adequately to prevent the combine form rolling. The engine does NOT need to be running.
2 Raise the header and engage the header safety latch. Stop the engine.
3 Verify that the brake reservoir is filled.
4 Slide a transparent hose over the RH outside bleed screw to catch the oil when bleeding.
5 Cab Operator holds down the LH brake pedal and pumps RH brake pedal.
6 Bleed Operator loosens RH outside caliper bleed valve (#1 in photo) to allow the air to bleed out, and then retightens it when oil comes out of the port.
7 Operator then loosens RH inside caliper bleed valve (#2 in photo) to allow the air to bleed out, and then retightens it when oil comes out of the port.
8 Operator in cab then holds down RH brake pedal and pumps LH brake pedal.
9 Repeat steps 5-7 for the LH side.
10 Check for the reservoir for proper oil level
