797 Off-Highway Truck Power Train Caterpillar

Illustration 1	g00772078
End view

Illustration 2	g00778832
Section A-A

Illustration 3	g00778839
Section B-B

Illustration 4	g00778840
Section C-C

Illustration 5	g00778841
Section D-D

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

Type of pump: Gear

Bench test requirements: SAE 10W oil must be stabilized at 82° ± 4°C (180° ± 10°F) before the test is performed.

(1) Torque for eight bolts ... 225 ± 7 N·m (166 ± 5 lb ft)

(2) Assemble the ring opening over the drain hole.

(3) As shown, assemble the shaft seals so that the spring loaded surfaces are opposite each other.

(4) 175-0312 Pump Body

Test at Full speed:

Output ... 297 L/min (78 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 1950 rpm

Test speed of pump ... 2069 rpm

Output ... 267 L/min (70 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 1950 rpm

Test speed of pump ... 2069 rpm

Test at Half Speed:

Output ... 149 L/min (39 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

Output ... 134 L/min (35 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 975

Test speed of pump ... 1035 rpm

(5) 193-7645 Body

Test at Full Speed:

Output ... 297 L/min (78 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 1950

Test speed of pump ... 2069 rpm

Output ... 267 L/min (70 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 1950 rpm

Test speed of pump ... 2069 rpm

Test at Half Speed:

Output ... 149 L/min (39 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

Output ... 134 L/min (35 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

(6) 198-5997 Body

Test at Full Speed:

Output ... 230 L/min (61 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 1950

Test speed of pump ... 2069 rpm

Output ... 207 L/min (55 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 1950 rpm

Test speed of pump ... 2069 rpm

Test at Half Speed:

Output ... 115 L/min (30 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

Output ... 104 L/min (27 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

(7) 175-2634 Body

Test at Full Speed:

Output ... 103 L/min (27 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 1950

Test speed of pump ... 2069 rpm

Output ... 93 L/min (25 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 1950 rpm

Test speed of pump ... 2069 rpm

Test at Half Speed:

Output ... 52 L/min (14 US gpm)

Test pressure ... 690 kPa (100 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

Output ... 47 L/min (12 US gpm)

Test pressure ... 6900 kPa (1000 psi)

Test speed of engine ... 975 rpm

Test speed of pump ... 1035 rpm

(8) Assemble the long end of 193-7648 Drive Gear toward the rear of the pump assembly.

(9) Outlet

(10) Inlet

(11) 175-0323 Pressure Plates must be assembled with the chamfers on the outlet side.

(12) Outlet

(13) Inlet

(14) 175-0324 Pressure Plates must be assembled with the chamfers on the outlet side.

(15) Outlet

(16) Inlet

(17) 154-8667 Pressure Plates must be assembled with the chamfers on the outlet side.

Illustration 6	g00778830
(A) Drive (B) Idler

Note: 175-0312 Pump Body (4) and 198-5997 Body (6) have special tooth relief gears. The rotation arrows that are shown on the gears must be assembled in the direction that is shown.