797 Off-Highway Truck Power Train Caterpillar

Illustration 1	g00734738

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

Type of pump: Gear

Lubricate the pump with oil before you operate the pump.

Note: The pump must rotate freely by using your hand.

Bench test requirements: SAE 10W oil must be stabilized at 52° ± 3°C (125° ± 5°F) before the test is performed.

(1) Transmission lubrication section

Output ... 566 L/min (150 US gpm)

Test pressure ... 480 kPa (70 psi)

Test speed for the pump ... 1800 rpm

(2) Torque converter charging section

Output ... 584 L/min (155 US gpm)

Test pressure ... 930 kPa (135 psi)

Test speed for the pump ... 1800 rpm

(3) Clearance between a new gear and a new body ... 0.130 ± 0.043 mm (.0051 ± .0017 inch)

(4) Gear

(5) Clearance between a new gear and a new cover ... 0.158 ± 0.033 mm (.0062 ± .0013 inch)

(6) Dimension of new shafts and of new pump bodies

Diameter of the drive shafts and diameter of the driven shafts ... 50.795 ± 0.005 mm (1.9998 ± .0002 inch)

Diameter of the bearing in the pump body ... 50.878 ± 0.035 mm (2.00307 ± 0.00138 inch)

(7) Keys

Note: Make sure that gear (4) slides freely on two keys (7).

Illustration 2	g00877195

(8) Depth of bearings into cover ... 1.50 ± 0.25 mm (.059 ± .010 inch)

(9) Location of the bearing joint from the vertical centerline ... 30 ± 15 degrees

Illustration 3	g00877201

(10) Location of the bearing joint from the vertical centerline ... 30 ± 15 degrees

(11) Depth of three dampers (B) into body ... 46.0 ± 0.5 mm (1.81 ± .02 inch)

(12) Measurement from end of the dowel to the face of the body ... 5.5 ± 0.5 mm (.22 ± .02 inch)

Note: This measurement is for all four dowels that are located in the body.

(13) Depth of two dampers (A) into body ... 26.5 ± 0.5 mm (1.04 ± .02 inch)

(14) Depth of bearings into body ... 1.50 ± 0.25 mm (.059 ± .0010 inch)

(15) Depth of damper (C) into body ... 26.5 ± 0.5 mm (1.04 ± .02 inch)

Illustration 4	g00877202

(16) Location of the bearing joint from the vertical centerline ... 30 ± 15 degrees

(17) Depth of bearings into cover ... 1.50 ± 0.25 mm (.059 ± .010 inch)