System Components - Komatsu HD1500-7 Operation & Maintenance Manual

Section 42 - Automatic Lubrication System
42-4

SYSTEM COMPONENTS

Filter
A filter assembly mounted on the grease reservoir fil-
ters the grease from the shop supply. A bypass indica-
tor alerts service personnel when the filter requires
replacement.
Hydraulic Motor and Pump
Hydraulic motor (3, Figure 42-1) and pump (9) together
are a fully hydraulic grease pump. An integrated pump
control manifold is incorporated with the motor to con-
trol input flow and pressure.
NOTE: The pump crankcase oil level must be
maintained to the level of the pipe plug port. Later
models are equipped with a dipstick (3, 42-6). Refill
with 10W-30 motor oil.
Hydraulic oil supply inlet pressure must not
exceed 20 685 kPa (3000 psi). Exceeding the rated
pressure may result in damage to system compo-
nents and personal injury.
Grease Reservoir
Grease reservoir (12) has an approximate capacity of
41 kg (90 lb) of grease. When the grease supply is
replenished, grease entering the system passes
through the filter to remove contaminants before set-
tling into the reservoir.
Pressure Reducing Valve
Pressure reducing valve (4), located on the manifold,
reduces the hydraulic supply pressure from the truck
steering circuit. Hydraulic pressure is reduced to an
operating pressure of 2240 to 2415 kPa (325 to 350
psi). The hydraulic motor operates at this pressure to
drive the grease pump. The pressure reducing valve
has been factory adjusted. DO NOT attempt to adjust
the setting.
Solenoid Valve
Solenoid valve (5), when energized, allows oil to flow to
the hydraulic motor.
Flow Control Valve
Flow control valve (10) mounted on the manifold, con-
trols the amount of oil flow to the hydraulic motor. The
flow control valve has been factory adjusted. DO NOT
attempt to adjust the setting.
Vent Valve
Vent valve (7, Figure 42-1) opens and closes to control
the pressure in the system. With the valve closed, the
pump continues to operate until maximum grease pres-
sure is achieved. As this occurs, the vent valve opens
and allows the grease pressure to drop to 0, so the
injectors can recharge for their next output cycle.
Injectors
Each injector (Figure 42-2) delivers a controlled
amount of pressurized lubricant to a designated lube
point.
Lubrication Timer
Lubrication timer (1, Figure 42-3) is a solid state con-
troller providing a 24 VDC timed-interval signal to ener-
gize solenoid valve (5, Figure 42-1). Operation of the
solenoid valve controls the oil flow to operate the
hydraulic motor. This controller is mounted in the elec-
trical compartment in the rear of the cab.
Pressure Gauge
Pressure gauge (8, Figure 42-1) monitors hydraulic oil
pressure to the inlet of the hydraulic motor.
NOTE: Newer models do not come equipped with a
pressure gauge. However, a gauge may be installed in
the port if desired.
04/10 OM4207