Komatsu 830E-AC Shop Manual page 1029

SYSTEM COMPONENTS
Filter
Filter assembly (21, Figure 3-2), mounted on the
grease reservoir, filters the grease prior to refilling
the reservoir from the shop supply. A bypass indica-
tor alerts service personnel when the filter requires
replacement.
Hydraulic Motor and Pump
Rotary hydraulic pump (3 & 9, Figure 3-1) is a fully
hydraulically operated grease pump. An integrated
pump control manifold is incorporated with the motor
to control input flow and pressure.
NOTE: The pump crankcase oil level must be
maintained to the level of the pipe plug (17, Figure 3-
2). If necessary, 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 the sys-
tem components and personal injury.
Grease Reservoir
Reservoir (12, Figure 3-1) has an approximate
capacity of 41 kg (90 lbs.) of grease. When the
grease supply is replenished by filling the system at
the service center, the grease is passed through the
filter to remove contaminants before it flows into the
reservoir.
Pressure Reducing Valve
Pressure reducing valve (4, Figure 3-1), located on
the manifold, reduces the hydraulic supply pressure
(from the truck steering circuit) to a suitable operating
pressure of 2241 - 2413 kPa (325 - 350 psi) for the
hydraulic motor used to drive the lubricant pump.
Flow Control Valve
Flow control valve (10, Figure 3-1), mounted on the
manifold, controls the amount of oil flow to the
hydraulic motor. The flow control valve has been
factory adjusted and the setting should not be
disturbed.
P03030
Solenoid Valve
Solenoid valve (5, Figure 3-1), when energized,
allows oil to flow to the hydraulic motor.
Vent Valve
With vent valve (7, Figure 3-1) closed, the pump con-
tinues to operate until maximum grease pressure is
achieved. As this occurs, the vent valve opens and
allows the grease pressure to drop to zero, so the
injectors can recharge for their next output cycle.
Lubrication Cycle Timer
The solid state lubrication cycle timer provides a 24
VDC timed-interval signal to energize the solenoid
valve (3, Figure 3-3) providing oil flow to operate the
grease pump motor. This timer is mounted in the
Electrical Interface Cabinet.
Pump Cutoff Pressure Switch
Pressure switch (18, Figure 3-2) is a normally open
switch set at 17,237 kPa (2500 psi). This switch de-
energizes the pump solenoid relay when the grease
line pressure reaches the switch pressure setting,
turning off the motor and pump.
Grease Pressure Failure Switch
Pressure switch (24, Figure 3-2) is a normally open
switch set at 13,789 kPa (2000 psi). This switch mon-
itors grease pressure in the injector bank on the rear
axle housing. If the proper pressure is not sensed
within 60 seconds (switch contacts do not close) a
warning lamp circuit to notify the operator a problem
exists in the lube system.
Pressure Gauge
Pressure gauge (8, Figure 3-1) monitors hydraulic oil
pressure to the inlet of the hydraulic motor.
Injectors
Each injector (23, Figure 3-2) delivers a controlled
amount of pressurized lubricant to a designated lube
point. Refer to Figure 3-2 for locations.
Automatic Lubrication System P3-5