854K Wheel Dozer Hydraulic System Caterpillar


Piston Pump (Hydraulic Fan)

Usage:

854K 221



Illustration 1g01431054

Displacement per revolution ... 140 cc (8.5 in3)

Rotation ... Counterclockwise

Cutoff pressure ... 24000 ± 350 kPa (3480 ± 50 psi)

Margin pressure ... 2100 ± 100 kPa (305 ± 15 psi)

(1) Torque for the four bolts ... 9 N·m (80 lb in)

(2) Torque for the O-ring plug ... 25 N·m (18 lb ft)

(3) Torque for the O-ring plug ... 147 N·m (110 lb ft)




Illustration 2g01444115

Section A-A

Low pressure standby ... 2300 kPa (335 psi)

Margin pressure at 1500 rpm ... 2100 ± 100 kPa (305 ± 15 psi)

Discharge pressure ... 2068 kPa (300 psi)

Displacement per revolution ... 70 cc (4.3 in3)




Illustration 3g01444530

Section B-B

High pressure stall with the pump at rated speed ... 24100 ± 350 kPa (3495 ± 50 psi)

(4) 194-3288 Spring

Free length ... 41.9 mm (1.65 inch)
Outside diameter ... 12.6 mm (0.50 inch)

(5) 194-3289 Spring

Free length ... 39.5 mm (1.56 inch)
Outside diameter ... 6.4 mm (0.25 inch)



Illustration 4g01431055

Note: Apply 4C-4030 Thread Lock Compound to the threads of piston guide (6) .

(6) Torque for the piston guide ... 200 N·m (150 lb ft)

(7) Torque for the two plug assemblies ... 40 N·m (30 lb ft)

(8) Torque for the four bolts ... 430 N·m (320 lb ft)

Note: Grind the spacer (9) to required thickness with the faces parallel within 0.05 mm (0.002 inch).

(9) 247-3761 Spacer

Quantity ... 1
Thickness of the spacer ... 3 mm (0.1 inch)

Note: Apply 4C-4030 Thread Lock Compound to the threads of plunger guide (10) .

(10) Torque for the plunger guide ... 180 N·m (135 lb ft)

(11) The break off plug is in the head.

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