This guide explains how to check piston travel and adjust the parking brake on CASE IH 20 Series Axial-Flow combines.
To maintain proper and consistent braking performance, inspect the parking brake clearance and make any necessary adjustments every 500 operating hours.
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Park Brake Piston Travel Check & Adjustment Procedure
1. Secure the Machine
Park the combine on a level surface. Block the wheels securely to prevent any movement.
2. Prepare the Header
Raise the header and engage the header safety latch. Shut off the engine.
3. Access the Brake Shaft
Remove the guard from the end of the parking brake shaft.
4. Measure Initial Shaft Protrusion
Measure and record the brake shaft protrusion distance.
5. Manually Release the Parking Brake
Release the parking brake manually. Refer to the “Manually Releasing Parking Brake” section of the service manual.
6. Measure Released Shaft Protrusion
Measure and record the shaft protrusion again.
7. Determine Piston Travel
Calculate the difference between the two measurements.
This value is the piston travel.
Required piston travel: 1/8 in. to 3/16 in. (3–5 mm)
- Less than 1/8 in.: Brake drag may occur.
- More than 3/16 in.: Brake reaction time may be excessive.
8. Adjust Shim Quantity
Loosen bolts (2) and add or remove shims as necessary.
- Each shim changes travel by approximately 5/64 in.
- Store any removed shim under bolts (2) for future adjustment.
9. Recheck Travel
Repeat steps 4 through 6 to confirm the piston travel is within specification.
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