793C and 793C XQ Off-Highway Truck Steering System Piston Pump (Steering) Caterpillar


Piston Pump (Steering)
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793C and 793C XQ Off-Highway Truck Steering System [SENR1451]



Illustration 1g00100682

Rotation of the pump is counterclockwise when the pump is viewed from the drive end.

Type of pump: Variable Displacement Piston Pump

Bench test requirements: SAE 10W oil must be stabilized at 65°C (150°F) before the test is performed.

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

Maximum standby pressure ... 3600 kPa (522 psi)

Pressure cutoff at zero flow ... 23100 ± 350 kPa (3350 ± 51 psi)

Test at Full Speed

Output ... 220 L/min (58 US gpm)
Test pressure ... 690 kPa (100 psi)
Test speed of pump ... 1838 rpm
Test speed of engine ... 1750 rpm
Output ... 209 L/min (55 US gpm)
Test pressure ... 6900 kPa (1000 psi)
Test speed of pump ... 1838 rpm
Test speed of engine ... 1750 rpm

Test at Half Speed

Output ... 110 L/min (29 US gpm)
Test pressure ... 690 kPa (100 psi)
Test speed of pump ... 919 rpm
Test speed of engine ... 875 rpm
Output ... 105 L/min (28 US gpm)
Test pressure ... 6900 kPa (1000 psi)
Test speed of pump ... 919 rpm
Test speed of engine ... 875 rpm

(1) Torque for plug ... 101.5 ± 4.5 N·m (75 ± 3 lb ft)

(2) Torque for three bolts ... 8.5 ± 1.0 N·m (75 ± 9 lb in)

(3) Torque for two screws ... 4.0 ± 0.4 N·m (35 ± 4 lb in)

(4) 9T-1699 Spring

Length under test force ... 11.10 mm (0.437 inch)
Test force ... 32.60 ± 3.11 N (7.33 ± 0.70 lb)
Free length after test ... 17.17 mm (0.676 inch)
Outside diameter ... 24.892 mm (0.9800 inch)



Illustration 2g00100725

View B-B

(5) Torque for four bolts ... 115 ± 12 N·m (85 ± 9 lb ft)

(6) Torque for four bolts ... 34 ± 3 N·m (25 ± 2 lb ft)

(7) 120-0575 Pressure Compensator Valve

Note: Refer to Steering Specifications, "Pressure and Flow Compensator Valve (Steering)" for additional information.

(8) Torque for two bolts ... 286 ± 29 N·m (211 ± 21 lb ft)




Illustration 3g00100690

View A-A

(9) Torque for plug ... 79 ± 4 N·m (58 ± 3 lb ft)




Illustration 4g00100684

Section C-C

(10) 6E-4215 Piston Kit

Torque for rod ... 79 ± 4 N·m (58 ± 3 lb ft)

Note: Apply 9S-3263 Thread Lock Compound to the threads of the rod prior to installation.

(11) 6E-4216 Pump Rotating Group

(12) Torque for two plugs ... 12.9 ± 0.2 N·m (9.48 ± 0.11 lb ft)

(13) 103-6282 Shaft Shim Kit

As required, use shims to achieve the correct axial shaft end play.
Axial shaft end play ... 0.010 to 0.100 mm (0.0004 to 0.0039 inch)

(14) 6E-4213 Piston Kit

Torque for rod ... 79 ± 4 N·m (58 ± 3 lb ft)

Note: Apply 9S-3263 Thread Lock Compound to the threads of the rod prior to installation.

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