1
Introduction
1
WABCO
Maintenance Manual 31 (Revised 08-18)
1 Introduction
Application
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System Saver 318 non-through drive version air compressor
used on Mack engines. Figure 1.1.
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System Saver 318 through-drive version air compressor used on
Mack engines. This unit is required to run hydraulic power
steering pumps. Figure 1.1.
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Swept volume displacement: 18.7 cubic feet per minute.
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Flange mounted to the engine.
— Coupling driven.
— Inlet air, oil lubrication and coolant supplied from the engine.
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Pneumatic pressure signal from the governor controls
compression:
— Integrated pressure relief valve protects the compressor
and engine if discharge or governor lines become blocked,
or if compressor cannot unload. The valve prevents the
compressor from pumping above 250 psi in the event of
a blocked discharge line or other malfunction.
Figure 1.1
Description
The WABCO System Saver 318 air compressor provides and
maintains air under pressure to operate devices in the air brake and
auxiliary air systems of a vehicle. It consists of two major
subassemblies: Cylinder head and crankcase/cylinder block.
Figure 1.2.
Figure 1.2
The
cylinder head
contains the inlet, discharge and unloader
valving, as well as an integral relief valve. There are two water ports,
marked Port 9, an air discharge port, marked Port 2, and an inlet
port, marked Port 0. The cylinder head is mounted on the
crankcase/cylinder block.
The
crankcase/cylinder block
contains the cylinder bore, piston,
bearings, crankshaft, governor port and connecting rod.
Figure 1.1
1003372b
NON-THROUGH DRIVE
THROUGH DRIVE
Figure 1.2
NON-THROUGH DRIVE
THROUGH DRIVE
1003373b
CYLINDER
HEAD
CRANKCASE
(CYLINDER BLOCK)
CYLINDER
HEAD
CRANKCASE
(CYLINDER BLOCK)
Summary of Contents for System Saver 318
Page 4: ...Notes...
