System Operation - Komatsu 830E Shop Manual

System Operation

Refer to Figure 3-3 & 3-4:
Normal Operation
1. During truck operation, with the pump and timer
systems in a rest state, a preset time interval
occurs.
2. The solid state system timer (1, Figure 3-4) pro-
vides a 24 VDC signal through the normally
closed contacts in relay RB6-K1 (12) used to
energize the pump solenoid valve (5), allowing
hydraulic oil provided by the truck steering
pump circuit to flow to the pump motor and ini-
tiate a pumping cycle.
3. The hydraulic oil pressure from the steering cir-
cuit is reduced to 325 to 350 psi (2 240 to 2 413
kPa) by the pressure reducing valve (4, Figure
3-3) before entering the motor. In addition, the
amount of oil supplied to the pump is limited by
the flow control valve (6). Pump pressure can
be read using the gauge (5) mounted on the
manifold.
4. With oil flowing into the hydraulic motor, the
grease pump will operate, pumping grease from
1. Hydraulic Oil Return
2. Hydraulic Oil Supply
3. Pump Solenoid Valve
4. Pressure Reducing Valve
P3-4
FIGURE 3-3. HYDRAULIC SCHEMATIC
5. Motor Pressure Gauge
6. Flow Control Valve
7. Hydraulic Motor
8. Grease Pump
Automatic Lubrication System
the reservoir to the injectors (13), through a
check valve (10) and to the vent valve (11) and
the normally open pressure switch (9).
5. During this period, the injectors will meter the
appropriate amount of grease to each lubrica-
tion point.
6. When grease pressure reaches the pressure
switch (4, Figure 3-4) setting, the switch con-
tacts will close and energize relay RB6-K1 (12),
removing power from the hydraulic motor/pump
solenoid (5) and the the pump will stop. The
relay will remain energized until grease pres-
sure drops and the pressure switch opens again
or until the timer turns off.
7. After the pump solenoid valve is de-energized,
hydraulic pressure in the manifold drops and
the vent valve (11, Figure 3-3) will open, releas-
ing grease pressure in the lines to the injector
banks. When this occurs, the injectors are then
able to recharge for the next lubrication cycle.
8. The system will remain at rest until the solid
state timer turns on and initiates a new grease
cycle.
9. Pressure Switch (N.O.)
10. Unloader Valve
11. Vent Valve
12. Orifice
13. Injector Bank
P03022