14M and 16M Motor Graders Machine Systems Lubrication System Caterpillar


Lubrication System
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1.1. Pump Operation
2.1. Electrical Operation
3.1. Lubrication Injectors
4.2. Stage 1
5.2. Stage 2
6.2. Stage 3
7.2. Stage 4

Pump Operation

The lubrication system consists of the lubrication pump and lubrication injectors. The pump is driven by an electric motor. The pump cycles ON and OFF. The pump supplies the injectors with grease. The injectors supply lubricant to bearings and to joints.



Illustration 1g01410087
(1) Lubrication tank
(2) Solenoid valve for venting
(3) Lubrication pump
(4) Electric motor

In the default setting, the electric motor (4) is cycled on every 120 minutes of machine operation. The lubrication cycle duration and the delay time can be adjusted using AVSpare Electronic Technician (ET). Electric motor (4) drives lubrication pump (3). Lubrication pump (2) will provide lubricant that is pressurized to the injectors. The lubrication pump (3) will activate for a duration of 240 seconds. Solenoid valve (2) will activate. Solenoid valve (2) will vent the grease at 18600 kPa (2700 psi). Pump (3) will turn OFF when solenoid valve (2) is venting. The cycle will be repeated at the next 120 minute interval of machine operation.

Electrical Operation

The transmission Electronic Control Module (ECM) uses the following two inputs for the Autolube system:

  • Autolube pressure sensor

  • Machine Speed

Before the pump can run through a complete cycle, the status of the Autolube system must be set to INSTALLED. Cat ET must be used in order to change the parameter in the transmission ECM. By using Cat ET, the following parameters will also be able to be customized: interval of Autolube, duration of Autolube and minimum Autolube pressure. All of these values will have default settings. All of these settings are able to be changed in order to match specific applications.

The transmission ECM keeps track of the amount of time that has passed since the last lubrication cycle. The transmission will not energize the Autolube relay in order to begin a new cycle until the correct amount of time has passed since the last lubrication cycle. The transmission ECM will also make sure that the machine speed is above zero before starting the next lubrication cycle.

The transmission ECM keeps track of the amount of time that has passed since the lubrication cycle has started. If the minimum Autolube pressure is reached within the preset time, the transmission ECM will end the lubrication cycle. If the preset minimum lubrication pressure is not met in the time that is specified, the lubrication cycle will be aborted. This will activate the E334 Low Autolube Pressure event.

The transmission ECM is constantly monitoring the lubrication pressure in the system while the Autolube system is not active. If the lubrication pressure does not drop below 7600 kPa (1100 psi) before the next cycle, the E521 Auto Lube Pressure Not Decreasing After Cycle event will be activated.

Note: The Monitoring System may be used to cycle the Autolube system manually.

Lubrication Injectors

When the pump is activated, the lubrication injectors will cycle one time. A complete cycle for the injectors consists of four stages.

Stage 1



Illustration 2g01410269
Stage 1
(5) Measuring chamber
(6) Piston for the injection
(7) Spring
(8) Valve port
(9) Slide valve
(10) Supply port for the lubricant
(11) Outlet port
(12) Discharge chamber

The injector is in the normal position or the rest position. Discharge chamber (12) is filled with lubricant from the previous cycle. Lubricant is directed to both sides of piston (6) through the port in slide valve (9).

Stage 2



Illustration 3g01410278
Stage 2
(5) Measuring chamber
(6) Piston for the injection
(7) Spring
(8) Valve port
(9) Slide valve
(10) Supply port for the lubricant
(11) Outlet port
(12) Discharge chamber

Slide valve (9) will move up when the lubrication pressure builds up. Lubricant will flow past the slide valve to the bottom of piston (6). Piston (6) will move up. This will force lubricant from measuring chamber (5) through outlet port (11). The discharge from outlet port (11) will provide lubricant to the bearing or the joint.

Stage 3



Illustration 4g01451641
Stage 3
(5) Measuring chamber
(6) Adjustment screw
(7) Piston for the injection
(8) Spring
(9) Valve port
(10) Slide valve
(11) Supply port for the lubricant
(12) Outlet port
(13) Discharge chamber

Piston (7) will dispense lubricant until the indicator stem hits the stop of adjusting screw (6). Adjusting screw (6) can adjust the volume of lubricant that is dispensed. Piston (7) and slide valve (10) will remain in the same position until the supply line is vented.

Stage 4



Illustration 5g01452201
Stage 4
(5) Measuring chamber
(6) Piston for the injection
(7) Spring
(8) Valve port
(9) Slide valve
(10) Supply port for the lubricant
(11) Outlet port
(12) Discharge chamber

After venting, spring (7) expands. This will move slide valve (9) so that passage (8) is closed. The lubrication pressure acts on both sides of piston (6). This causes piston (6) to move down. Some of the lubricant on the bottom of the piston will move across the slide valve and to the top of the piston into measuring chamber (5). The injector is now ready for the next cycle.

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