1.3.8 Timing gears
(1) Camshaft gear
(2) Idler gear
(3) High-pressure pump gear
(4) Crankshaft gear
(5) PTO gear
(6) Small idler gear
The timing gear drives the camshaft, high-pressure
pump and oil pump. The timing gear train consists
of hardened, helically cut gear wheels. The gears
are encased by the timing gear casing, which is
fitted to the front of the engine.
The idler gear is supported with a ball bearing on
the shaft on the front face of the cylinder block.
Fig. 5 Narrow timing gear
There are three main types of timing gear
assembly: narrow without PTO, broad with light
duty PTO and broad with heavy duty PTO.
If the engine is equipped with light duty PTO,
hydraulic pump is driven via a gear or a separate
drive unit.
In engines with heavy duty PTO, hydraulic pump or
compressor is driven via a small idler gear.
Fig. 6 Broad timing gear, light duty PTO
Fig. 7 Broad timing gear, heavy duty PTO
1. Introduction
4th Generation Engines 1-15
8370 79492
To Next Page
Loading...
