Automatic Lubrication System; General Description - Komatsu 730E Operation & Maintenance Manual

OM4211 07/09

Automatic Lubrication System

GENERAL DESCRIPTION

The automatic lubrication system is a pressurized
lubricant delivery system which delivers a controlled
amount of lubricant to designated lubrication points.
The system is controlled by an electric timer which
signals a solenoid valve to operate a hydraulic motor
powered grease pump. Hydraulic oil for pump opera-
tion is supplied by the truck steering circuit.
Grease output is proportional to the hydraulic motor
input flow. A pump control manifold (4, Figure 42-1),
mounted on top of hydraulic motor (2), controls input
flow and pressure. 24VDC solenoid (5) mounted on
the manifold turns the pump on and off.
NOTE: Newer models are equipped with fixed
hydraulic motor controls.
The pump is driven by the rotary motion of the
hydraulic motor, which is then converted to recipro-
cating motion through an eccentric crank mechanism.
The reciprocating action causes the pump cylinder to
move up and down. The pump is a positive displace-
ment, double-acting type as grease output occurs on
both the up and the down stroke.
FIGURE 42-1. PUMP COMPONENTS
1. Orifice Fitting
2. Hydraulic Motor
3. Pressure Reducing
Valve
4. Pump Control
Manifold
5. Solenoid Valve
AUTOMATIC LUBRICATION SYSTEM
6. Dipstick
7. Pump Assembly
8. Flow Control Valve
9. Grease Outlet
10. Grease Pickup Tube
11. Manual Override
During the down stroke, the pump cylinder is
extended into the grease. Through the combination of
shovel action and vacuum generated in the pump cyl-
inder, the grease is forced into the pump cylinder.
Simultaneously, grease is discharged through outlet
(9) 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, and 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 of 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 of the lowest rated
component in the system.
• DO NOT alter or modify any part of this
system unless approved
authorization.
• DO NOT attempt to repair or disassemble the
equipment while the system is pressurized.
• Ensure all fluid connections are securely
tightened before using this equipment.
• Read and follow the fluid manufacturer's
recommendations
compatibility, and the use of protective
clothing and equipment.
• Check all equipment regularly and repair, or
replace, worn or damaged parts immediately.
This equipment generates very high grease pres-
sure. Relieve pressure before disconnecting
hydraulic lines.
Pressurized hydraulic fluid can have sufficient
force to enter a person's body by penetrating the
skin. This can cause serious injury and possibly
death. If fluid has penetrated the skin, seek medi-
cal treatment by a physician familiar with this
injury, immediately.
Maintenance - Section 42
Page 42-1
by factory
regarding fluid