797F and 797F XQ Off-Highway Truck Braking System Caterpillar

Piston Pump (Brake Cooling) - Extra Retarding

Usage:

797F LAJ

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Illustration 1	g01963814

Rotation ... Clockwise

Maximum displacement per revolution ... 130 cc (8 cubic inch)

Setting for pressure override valve ... 35000 ± 3000 kPa (5076 ± 435 psi)

(1) Torque for four bolts ... 430 N·m (317 lb ft)

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Illustration 2	g01963813
Section A-A (2) Pump control valve (brake cooling) (3) Pump rotating (brake cooling piston pump) (4) Spring (5) Pump head (brake cooling piston pump)

(4) 117-5926 Spring

Free length ... 62 mm (2.4 inch)

Outside diameter ... 20.2 mm (0.80 inch)

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Illustration 3	g01954639
Detail A (6) Rod (7) Spring (8) Piston

(6) Use anyone of the following rod to obtain the dimension (C):

Length of the 146-6554 Rod ... 129.4 mm (5.09 inch)

Length of the 117-5917 Rod ... 129.6 mm (5.10 inch)

Length of the 146-6555 Rod ... 129.8 mm (5.11 inch)

Length of the 178-2844 Rod ... 130.0 mm (5.12 inch)

(7) 117-5920 Spring

Free length ... 86.4 mm (3.40 inch)

Outside diameter ... 28.6 mm (1.13 inch)

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