415F2 IL Backhoe Loader Axles, Differentials and Brakes Service Brake Control - Adjust Caterpillar

Show/hide table

Personal injury or death can result from machine movement. Place blocks in front of and behind the wheels to make sure the machine does not move while the parking brakes are disengaged.

Specifications

Introduction

The following information explains the adjustment of the service brake controls and measurement of the service brake disc thickness

Required Tools

Test Preparation - Service Brake Controls

1. Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.

2. Permit only one operator on the machine. Keep all other personnel away from the machine or in the operators sight.

3. Move the transmission control to the NEUTRAL position.

4. Lower the boom. If equipped, lower the work tool to the ground.

5. Engage the parking brake and stop the engine.

6. If the machine is in a confined area, ensure that exhaust gases are vented to the outside when the engine is operated.

7. Make sure that all the oil pressure is released before you perform any of the following procedures:

   • Loosen any fitting, any hose, or any component.

   • Tighten any fitting, any hose, or any component.

   • Remove any fitting, any hose, or any component.

   • Adjust any fitting, any hose, or any component.

Adjustment Procedure - Service Brake Controls

Show/hide table

Illustration 1	g03688780
(4) Right brake pedal (5) Left brake pedal (6) Lock plate

1. Unlock the lock plate (6).
   Show/hide table

   Illustration 2	g03688782
   (4) Right brake pedal (5) Left brake pedal (6) Lock plate (7) Rod end (8) Locknut (9) Pushrod (10) Master cylinder (11) Boot

   Note: The brakes have identical controls. Adjust one brake control at a time.

2. Unseat the boots (11) from the master cylinder (10).
   Show/hide table

   Illustration 3	g03688764
   (A) 0.56 mm to 0.90 mm (0.022 inch to 0.035 inch) (B) Limit Switch (1) Stop Plate (2) Locknut (3) Set bolt (4) Right brake pedal (5) Left brake pedal

3. Pull both pedals (4) and (5) upward. Adjust the set bolt (3) so that the lock plate (6) aligns with the slot for the lock plate in right-hand pedal (4). Tighten locknut (2). Ensure that the limit switches (B) engage when the pedals are against the stops.

4. Depress the brake pedal (4) and release the brake pedal. This process is called stroking. Fully stroke and release brake pedal (4) six times to obtain the nominal position of the master cylinder piston.

5. Loosen nut (8).

6. Back off pushrod (9). Insert a 0.76 mm (0.030 inch) shim between the brake pedal (4) and the set bolt (3). Adjust pushrod (9) until contact is made between the pedal and the shim. Also, adjust pushrod (9) until initial resistance is felt from the master cylinder (10). Tighten nut (8) to a torque of 20 ± 5 N·m (177 ± 44 lb in). Pushrod (10) should not be allowed to move when nut (8) is tightened. Remove the shim.

7. Move pushrod (9) and rod end (7) to ensure that free play exists. Measure the gap (A) that is between the brake pedal and the set bolt (3) with a feeler gauge. The measurement on the gap (A) should read a minimum of 0.56 mm (0.022 inch).

   Note: Ensure that a 0.9 mm (0.04 inch) shim will not fit between the stop on the brake pedal and the plate assembly.

8. Adjust the brake pedal if the gap is not within allowed specifications.

9. Repeat the above procedure for the left brake pedal.

   Note: For the left pedal (5), you will use the lock plate (1) instead of the set bolt (3).

10. Ensure that the Lock plate (6) aligns with the slot for the lock plate (C).

11. Ensure that boots (11) are sealed properly against the master cylinder.