PUMP GP-PISTON 4600078 - Caterpillar

Removal Procedure
Start By:
Remove the camshaft gear. Refer to Disassembly and Assembly, "Camshaft Gear - Remove and Install".
Remove the electronic unit injectors. Refer to Disassembly and Assembly, "Electronic Unit Injector - Remove".
Remove the valve mechanism cover base. Refer to Disassembly and Assembly, "Valve Mechanism Cover Base - Remove and Install".
Remove the turbochargers. Refer to Disassembly and Assembly, "Turbocharger - Remove".
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine.
Drain the cooling system. Refer to Operation and Maintenance Manual, "Cooling System Coolant - Change".
Illustration 1 g01056681
Remove bolts (2) and thrust plate (1).
Illustration 2 g01116390
Remove sealing plate (3) and adapter assembly (4).
Illustration 3 g01056684
Remove O-ring seal (5) and O-ring seal (6) from sealing plate (3).
Illustration 4 g01117768
Disconnect hose assembly (8).
Disconnect hose assembly (12).
Remove bolts (10). Position fuel filter base (9) out of the way.
Remove bolt (11) and the breather tube from the cylinder head.
Remove bolts (7) and remove the bracket from the cylinder head.
Disconnect boost pressure sensor (13).
Disconnect inlet air temperature sensor (14).
Illustration 5 g01116398
Remove water temperature regulator housing (17).
Remove strap (18).
Attach a suitable lifting device to cylinder head (16). The weight of the cylinder head is approximately 235 kg (518 lb).
Remove cylinder head bolts (15).
Carefully remove cylinder head (16).
Illustration 6 g01117797
Remove cylinder head gasket (19).
Remove spacer plate (20).
Remove seals (24) and seal (22).
Remove spacer plate gasket (23).
Remove O-ring seal (21) from the dowel in the cylinder block.