Maintenance - Section 42 06/06 0M4206 Page 42-12 Automatic Lubrication System SYSTEM CHECKOUT To check system operation, not including the timer, proceed as follows: To check the solid-state timer operation without wait- ing for the normal timer setting, proceed as follows: NOTE: The timer incorporates a liquid and dust-tight cover which must be in place and secured at all times during truck operation. 1. Start the engine. 2. Actuate the test switch at the reservoir/pump assembly. 1. Remove the dust cover. 3. The motor and pump will operate until the sys- tem attains 20685 kPa (3000 psi). 2. Adjust timer selector (3, Figure 42-12) to the five minute interval setting 4.
Once the required pressure is achieved, the pump motor will turn off and the system will vent. . 5. Check for pump, hose, or injector damage or leakage when the system is pressurized. 6. After checking the system, shut the engine off. Observe normal precautions regarding high voltage present in the propulsion system before attempting to repair the lubrication system. Lubrication Cycle Timer Check FIGURE 42-12. LUBRICATION CYCLE TIMER (Shown With Cover Removed) 1. Timer Enclosure 2. Red LED 3. Timer Selector 3. The timer must cycle in five minutes if the truck is operating. NOTE:
If the timer check is being made on a cold start, the first cycle will be approximately double the nominal setting. All subsequent cycles must be within the selected time tolerance. 4. Perform voltage checks at the timer if the above checks do not identify the problem. a. Ensure that the timer ground connection is clean and tight. b. With the key switch on, use a voltmeter to read the voltage between the positive and negative posts on the solid-state timer. A nor- mal reading must be 18 to 26VDC, depend- ing upon whether the engine is on or not. FIGURE 42-11. LOCATION OF LUBRICATION CYCLE TIMER 1. Cab Interface Compartment 2. Lubrication Cycle Timer