793B Off-Highway Truck Air System and Brakes Caterpillar

Illustration 1	g00122958

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

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

Drive End

Test at Full Speed:

Output ... 384.3 L/min (101.4 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 1840 rpm

Test speed of pump ... 1750 rpm

Output ... 377.1 L/min (99.5 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 1840 rpm

Test speed of pump ... 1750 rpm

Test at Half speed:

Output ... 191.8 L/min (50.6 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 920 rpm

Test speed of pump ... 875 rpm

Output ... 182.7 L/min (48.2 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 920 rpm

Test speed of pump ... 875 rpm

Cover End

Test at Full Speed:

Output ... 384.3 L/min (101.4 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 1840 rpm

Test speed of pump ... 1750 rpm

Output ... 377.1 L/min (99.5 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 1840 rpm

Test speed of pump ... 1750 rpm

Test at Half speed:

Output ... 191.8 L/min (50.6 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 920 rpm

Test speed of pump ... 875 rpm

Output ... 182.7 L/min (48.2 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 920 rpm

Test speed of pump ... 875 rpm

(1) Torque for the four studs on the pump drive housing ... 65 ± 10 N·m (48 ± 7 lb ft)

(2) Torque for eight nuts ... 238 ± 13 N·m (175 ± 10 lb ft)

(3) Assemble the shaft seals so that the spring-loaded surfaces are opposite each other.