PUMP GP-INJECTOR 20R1644 - Caterpillar

1. Install the fuel injection pump housing on tool (A).2. Install timing pin (1) to keep the injection pump camshaft from turning during disassembly and assembly. 3. Install bolt (B) in the threads of sleeve (3). Tighten the bolt until sleeve can be removed.
Do not hit on bolt or sleeve. This will cause damage to the unit.
4. Remove bolts (4) that hold body to the housing.5. Remove body (2) from the housing. 6. Remove idler gear (6) from body.7. Remove O-ring seal (5) and the two lip-type seals from body. 8. Remove drive gear (8) from shaft.9. Remove key (7) from the shaft.Install Fuel Transfer Pump
1. Install the inner seal in the body with tooling (A). The lip of seal must be toward the pump gears.2. Install the outer seal in the body with tooling (B). The lip of seal must be toward the outside.
Always be careful not to scratch or cause damage to the machined surface of the pump body.
3. Install the O-ring seal (2) and idler gear (1) on the body. 4. Install the key and drive gear (3) on the shaft. 5. Install the body (4) on the housing.6. Install the bolts that hold the body to the housing. The pump body for the truck engine fuel system has an oil passage through the pump body. Other pump bodies do not have the oil passage. 7. Put sleeve (5) in position on camshaft. The timing pin (6) must be in position as shown to keep the camshaft from turning during assembly.8. Install sleeve on camshaft with tooling (C).
Do not hit the sleeve with a hammer to install it. This will put end force on the camshaft and cause damage to the other components in the pump housing.
9. The end clearance of the camshaft must be 0.58 0.46 mm (.023 .018 in.) after sleeve (5) is installed.end by:a) install fuel injection pump housing and governor