797 Off-Highway Truck Power Train Caterpillar

Illustration 1	g00735635

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) Gear

(2) Clearance between a new gear and a new body ... 0.168 ± 0.043 mm (0.0066 ± 0.0017 inch)

(3) Transmission scavenge section

Output ... 855 L/min (225 US gpm)

Test pressure ... 70 kPa (10 psi)

Test speed for the pump ... 1800 rpm

(4) Clearance between a new gear and a new cover ... 0.107 ± 0.026 mm (0.0042 ± 0.0010 inch)

(5) Transmission charging section

Output ... 295 L/min (78 US gpm)

Test pressure ... 3100 kPa (450 psi)

Test speed for the pump ... 1800 rpm

(6) Keys

(7) 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 ± 0.0002 inch)

Diameter of the bearings in the pump body ... 50.851 ± 0.008 mm (2.0020 ± 0.0003 inch)

Note: Make sure that gear (1) slides freely on two keys (6).

Illustration 2	g00735054

(8) Measurement from end of the dowel to the face of the cover ... 5.5 ± 0.5 mm (0.22 ± 0.02 inch)

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

(10) Depth of bearings into cover ... 1.50 ± 0.25 mm (0.059 ± 0.010 inch)

Illustration 3	g00735058

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

(12) Depth of two dampers (A) into body ... 42.0 ± 0.5 mm (1.65 ± 0.02 inch)

(13) Depth of bearings into body ... 1.5 ± 0.5 mm (0.059 ± 0.02 inch)

(14) Depth of four dampers (B) into body ... 15.0 ± 0.5 mm (0.59 ± 0.02 inch)

Illustration 4	g00735061

(15) Measurement from end of the dowel to the face of the body ... 5.5 ± 0.5 mm (0.22 ± 0.02 inch)

Illustration 5	g00735062

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

(17) Measurement from face of cover to face of sleeve ... 11.0 ± 0.5 mm (0.43 ± 0.02 inch)

(18) Depth of bearings into cover ... 1.50 ± 0.25 mm (0.059 ± 0.010 inch)