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OM4213 7/11
GENERAL DESCRIPTION
The automatic lubrication system is a pressurized
lubricant delivery system which delivers a controlled
amount of lubricant to designated lube points. The
system is controlled by an electronic timer which
signals a solenoid valve to operate a hydraulic motor
powered grease pump. Hydraulic oil for pump
operation is supplied by the truck steering circuit.
Grease output is proportional to the hydraulic motor
input flow. A pump control manifold, mounted on top
of the hydraulic motor, controls input flow and
pressure. A 24VDC solenoid mounted on the
manifold turns the pump on and off.
The pump is driven by the rotary motion of the
hydraulic motor, which is then converted to
reciprocating motion through an eccentric crank
mechanism.
FIGURE 42-1. PUMP & RESERVOIR
1. Hose From Filter
2. Vent Hose
3. Hydraulic Motor
4. Pressure Reducing
Valve
5. Solenoid Valve
6. Override Switch
AUTOMATIC LUBRICATION SYSTEM
7. Vent Valve
8. Pipe Plug
9. Pump Assembly
10. Flow Control Valve
11. Pressure Switch
12. Grease Reservoir
Automatic Lubrication System - Section 42
The reciprocating action causes the pump cylinder to
move up and down. The pump is a positive
displacement, double-acting type as grease output
occurs on both the up and the down stroke.
During the down stroke, the pump cylinder is
extended into the grease. Through the combination
of shovel action and vacuum generated in the pump
cylinder chamber, the grease is forced into the pump
cylinder. Simultaneously, grease is discharged
through the outlet of the pump. The volume of grease
during intake is twice the amount of grease output
during one cycle. During the upstroke, the inlet check
valve closes. One half of the grease taken in during
the previous stroke is transferred through the outlet
check and discharged to the outlet port.
Over-pressurizing the system, modifying parts,
using incompatible chemicals and fluids, or
using worn or damaged parts may result in
equipment damage and/or serious personal
injury.
• DO NOT exceed the stated maximum working
pressure of the pump or the lowest rated
component in the system.
• Do not alter or modify any part of this system
unless approved by the factory.
• Do not attempt to repair or disassemble the
equipment while the system is pressurized.
• Make sure all fluid connections are securely
tightened before using this equipment.
• Always
read
and
manufacturer's recommendations regarding
fluid compatibility, and the use of protective
clothing and equipment.
• Check all equipment regularly. Repair or
replace worn or damaged parts immediately.
This equipment generates very high grease
pressure. Extreme caution must be used when
operating this equipment as material leaks from
loose or ruptured components can inject fluid
through the skin and into the body causing
serious bodily injury including possible need for
amputation.
Adequate
recommended to prevent splashing of material
onto skin or into the eyes.
If any fluid appears to penetrate the skin, get
emergency medical care immediately! Do not
treat as a simple cut. Tell attending physician
exactly what fluid was injected.
Page 42-1
follow
the
fluid
protection
is
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