5.5 Group 5 - Supply unit, pumps and control valves
5.5.1 Servo oil pump
The servo oil pumps (004, Figure 5-32) supply the servo oil system with oil during usual
operation. The number of servo oil pumps is related to the engine.
The pressure value is related to the engine load. The electrically controlled system adjusts the
system pressure for the full load range, ie high pressure (approximately 300 bar) at high engine
load, and decreased pressure at low engine load.
Flow sensors monitor the oil supply in each inlet pipe of the servo oil pumps. A malfunction of a
servo oil pump will show in the alarm and monitoring system.
If a servo oil pump cannot turn, for safety the waisted shaft (003) will break. This will prevent too
much damage to the supply unit drive.
Also if one servo oil pump becomes defective, the engine can continue to operate at full load.
NOTE: Do not operate the engine with a defective servo oil pump for too long. You must
replace a defective servo oil pump as soon as possible.
Fig 5-32 Servo oil pump (example)
Legend
001 Supply unit 003 Shaft
002 Intermediate wheel (supply unit) 004 Servo oil pump
X92DF
AA00-5551-00AAA-043A-A
Operation Manual Servo oil pump
Winterthur Gas & Diesel Ltd.
- 206 - Issue 002 2020-08
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