3508 EUI Engines for Caterpillar Built Machines Caterpillar

Illustration 1	g01621126
(3) Check valve (4) Cap

When the fuel transfer pump group is viewed from the drive end, the drive gear rotates in the clockwise direction.

Minimum output ... 21 L/min (5.5 US gpm)

Minimum output is attained under the following conditions:

Pump pressure ... 415 kPa (60 psi)

Pump speed ... 2400 rpm

Minimum cracking pressure of bypass valve ... 620 kPa (90 psi)

Maximum pressure of fully open bypass valve ... 965 kPa (140 psi)

(1) Dimensions for terminal bushing

Inside diameter of the terminal bushing for gear shaft ... 12.783 mm (0.5033 inch)

Installation depth of terminal bushing ... 1.5 ± 0.5 mm (0.06 ± 0.02 inch)

(2) Dimensions for drive shaft assembly

Diameter of the shaft ... 12.700 to 12.675 mm (0.5000 to 0.4990 inch)

Diameter of the gear ... 29.801 ± 0.006 mm (1.1733 ± 0.0002 inch)

Length of the gear ... 25.347 ± 0.008 mm (0.9979 ± 0.0003 inch)

(5) Dimensions for idler gear assembly

Diameter of the gear ... 29.801 ± 0.006 mm (1.1733 ± 0.0002 inch)

Length of the gear ... 25.347 ± 0.008 mm (0.9979 ± 0.0003 inch)

(6) 1W-4655 Relief Valve Spring

Free length ... 28.4 mm (1.12 inch)

Outside diameter ... 10.7 mm (0.42 inch)