Service Repair Manual
312E and 312E L Excavator
Model: 312E L EXCAVATOR WEY
Configuration: 312E & 312E L Excavators WEY00001-UP (MACHINE) POWERED BY C4.4 Engine
Disassembly and Assembly
C4.4 Engines for Caterpillar Built Machines
Media Number -UENR0602-11
Publication Date -01/08/2013
Date Updated -25/10/2017
Gear Group (Front) - Remove and Install - Heavy Duty Gear
SMCS - 1206-010
Tool Part Number
Engine Turning Tool
Timing Pin (Camshaft)
(Fuel Injection Pump)
Timing Pin (Crankshaft)
a. Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove and
Install" for the correct procedure.
b. Remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve
Mechanism Cover - Remove and Install" for the correct procedure.
312E & 312E L Excavators WEY00001-UP (MACHINE) POWERED BY C4.4 Engin...
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
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
Dispose of all fluids according to local regulations and mandates.
Note: Care must be taken in order to ensure that the fuel injection pump timing is not lost during
the removal of the front gear group. Carefully follow the procedure in order to remove the gear
1. If the air compressor is equipped with a hydraulic pump, remove the hydraulic pump. Refer
to Original Equipment Manufa