System Components; Filter; Hydraulic Motor And Pump; Grease Reservoir - Komatsu 930E-4SE Operation & Maintenance Manual

OM4213 7/11

SYSTEM COMPONENTS

Filter

Filter assembly (21, Figure 42-2) mounted on the
grease reservoir filters the grease prior to refilling the
reservoir from the shop supply. A bypass indicator
alerts service personnel when the filter requires
replacement.

Hydraulic Motor and Pump

Rotary hydraulic pump (3 & 9, Figure 42-1) 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
42-2) or use the dip stick. If necessary, refill with
10W-30 motor oil.
Hydraulic oil supply inlet pressure must not
exceed 24 132 kPa (3,500 psi). Exceeding the
rated pressure may result in damage to the sys-
tem components and personal injury.

Grease Reservoir

Reservoir (12, Figure 42-1) has an approximate
capacity of 41 kg (90 lb) 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 42-1), located on
the manifold, reduces the hydraulic supply pressure
(from the truck steering circuit) to a suitable operating
pressure for the hydraulic motor used to drive the
lubricant pump. The pressure control valve has
been factory adjusted and the setting should not
be disturbed unless grease output pressure is
outside the recommendations.
A pressure gauge can be installed where pipe plug
(8, Figure 42-1) is located. The pressure gauge will
indicate hydraulic oil pressure to the inlet of the
hydraulic motor. Normal pressure is 2241 - 2413 kPa
(325 - 350 psi).
Automatic Lubrication System - Section 42

Flow Control Valve

Flow control valve (10, Figure 42-1) 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.

Solenoid Valve

Solenoid valve (5, Figure 42-1), when energized,
allows oil to flow to the hydraulic motor.

Vent Valve

With vent valve (7, Figure 42-1) closed, the pump
continues 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 solenoid valve
(3, Figure 42-3) providing oil flow to operate the
grease pump motor. This timer is mounted in the
Electrical Interface Cabinet.
Over Pressure Cut Off Switch
Pressure switch (18, Figure 42-2) is a normally open
switch set at 20 684 kPa (3,000 psi). This switch de-
energizes the pump solenoid relay if the grease line
pressure reaches the switch pressure setting, turning
off the motor and pump.

Grease Pressure Failure Switch

Pressure switch (24, Figure 42-2) is a normally open
switch set at 13 789 kPa (2,000 psi). If the
appropriate grease pressure is not achieved during
the normal pump cycle, the warning system will be
activated, illuminating the warning lamp in the
overhead display to notify the operator a problem
exists in the lube system.

Injectors

Each injector (23, Figure 42-2) delivers a controlled
amount of pressurized lubricant to a designated lube
point. Refer to Figure 42-2 for locations.

Relief Valve (unloader valve)

Relief valve (14, Figure 42-3) protects the pump from
high pressures. This relief valve is set at 27 580 kPa
(4,000 psi).
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