GEAR PUMP GROUP 7J4918 - Caterpillar

Be careful when the injection pumps are disassembled. Do not damage the surfaces of the plungers, barrels and bonnets. Any scratches will cause leakage inside the fuel injection pump. The plunger and barrel for each pump are made as a set. Do not put the plunger of one pump in the barrel of another pump. If one part has wear, install a complete new pump assembly. Be careful when the plunger is put into the bore of the barrel.
1. Pull plunger (1) and washer (5) out of barrel (3) and spring (2).2. Remove washer (5) from plunger (1).
Do not remove the gear from the plunger. The gear and plunger are assembled and adjusted at the factory.
3. Remove spring (2) from barrel (3).4. Remove ring (6), and make a separation of barrel (3) and bonnet (4). 5. Remove check assembly (7) and spring (8) from bonnet (4). If check assembly (7) is disassembled, do not mix parts with parts from another check assembly.Assemble Fuel Injection Pumps
Put clean fuel oil on all parts during assembly.
1. Install spring (2) and check assembly (1) in bonnet (3). 2. Install bonnet (3) on barrel (4), and install ring (5) to hold them together. Do not slide bonnet (3) across barrel (4) because check assembly (1) in the bonnet can cause damage to the face of barrel (4).3. Install spring (8) on barrel (4).4. Install washer (7) on plunger (6) with the flat side toward the gear on the plunger.5. Install plunger (6) in barrel (4) until washer (7) is engaged in the spring.END BY:a. install fuel injection pumps**See Fuel Injection Pump Housing in this module.