994D Wheel Loader Braking System Caterpillar


Brake Control

Usage:

994D 3TZ



Illustration 1g00612631

(1) Torque for the three mounting bolts ... 50 ± 10 N·m (37.0 ± 7.0 lb ft)

(4) 2P-5677 Spring

Length under test force ... 61.9 mm (2.44 inch)
Test force ... 133 ± 11 N (30.0 ± 2.4 lb)
Free length after test ... 105.2 mm (4.14 inch)
Outside diameter ... 25.4 mm (1.00 inch)

(5) Apply 1P-0808 Grease to the shaft assembly prior to assembly.

(6) Tighten the pressure switch for the brake accumulators to the following torque. ... 35 ± 3 N·m (25.0 ± 2.0 lb ft)

(7) Roller switch for the stop lamp

(8) Tighten the pressure switch for the parking brake to the following torque. ... 35 ± 3 N·m (25.0 ± 2.0 lb ft)




Illustration 2g00612641

View A-A




Illustration 3g00612644

View B-B

(11) Tighten the nut to the following maximum torque. ... 20 N·m (14.8 lb ft)

(12) Torque for the two bolts ... 80 ± 4 N·m (60.0 ± 3.0 lb ft)




Illustration 4g00612664

View C-C

(19) Apply 1P-0808 Grease to the shaft assembly prior to assembly.

Adjustment Procedure




Illustration 5g00612705

Detail D

(3) Rod assembly for the neutralizer valve

(20) Rod assembly for the service brake valve

(22) Cable assembly for the left pedal

(23) Cable assembly for the service brake pedal

  1. Adjust rod (3) in order to set the length from pin (2) to pin (14). The length from pin (2) to pin (14) should be equal to 123 mm (4.8 inch).

  1. Set dimension (A) at 137.2 mm (5.40 inch).

  1. Adjust screw (9) in lever (15) to Dimension (B). Dimension (B) is equal to 0.5 ± 0.3 mm (.02 ± .01 inch).

  1. After cable assemblies (22) and (23) are attached, adjust screw (21) in lever (18) to Dimension (C). Dimension (C) is equal to 0.5 ± 0.3 mm (.02 ± .01 inch). Dimension (C) is the gap between screw (21) and lever (17) .

Adjustment of the Roller Switch Assembly for the Stop Lamp

  1. With the brake valve in the OFF position, bring roller switch (7) into light contact with the surface of the ramp. The brake valve is in the OFF position when stem (10) is fully extended.

  1. Move bracket (13) by 2.75 mm (.108 inch) toward the ramp. Moving the bracket will depress the roller switch to the OFF position.
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