System Operation - Komatsu HD1500-7 Operation & Maintenance Manual

Section 42 - Automatic Lubrication System
42-6

SYSTEM OPERATION

1. During truck operation, the lubrication controller
will energize the system at a preset time interval.
2. The controller provides 24 VDC to energize the
pump solenoid valve. The solenoid controls the
hydraulic oil provided by the steering circuit. The
hydraulic oil drives the motor and pump.
3. Hydraulic oil pressure from the steering circuit is
reduced to 2240 to 2413 kPa (325 to 350 psi) by
pressure reducing valve (4, Figure 42-5) before
entering the motor. The amount of oil supplied to
the pump is limited by flow control valve (6).
Pump pressure can be read using gauge (5)
mounted on the manifold.
4. With oil flowing into the hydraulic motor, the
grease pump suctions grease from the reservoir.
Grease output from the pump flows through check
valve (10) to injectors (13) and to vent valve (11).
1. Hydraulic Oil Return
2. Hydraulic Oil Supply
3. Pump Solenoid Valve
4. Pressure Reducing Valve
5. Motor Pressure Gauge
5. During this period, the injectors will meter the
6. When the timing period is complete, the controller
7. After the pump solenoid is de-energized, hydrau-
8. The system will remain at rest until the lubrication
FIGURE 42-5. HYDRAULIC SCHEMATIC
6. Flow Control Valve
7. Hydraulic Motor
8. Grease Pump
9. Pressure Switch (Optional)
10. Check Valve
appropriate amount of grease to each lubrication
point.
will remove the power from the pump solenoid
valve.
lic pressure in the manifold drops and vent valve
(11) will open. When the vent valve opens, grease
pressure in the lines is released to the injector
banks. When this occurs, the injectors are then
able to recharge for the next lubrication cycle.
controller turns on and initiates a new grease
cycle.
11. Vent Valve
12. Orifice
13. Injector Bank
04/10 OM4207