Maintenance - Section 4 OM4006.2 10/98 Page 4-18 Automatic Lube System 6. Observe the 5000 PSI (35 MPa) pressure test gauge in the grease supply line. Pressure should be 2500 - 3000 PSI (17.2 - 20.7 MPa). 3. The timer should cycle in five minutes if the truck engine 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 should be within the selected time tolerance . DO NOT EXCEED Maximum Pump Pressure of 3500 p.s.i. (24.1 MPa). Exceeding this value will damage components and/or cause components to rupture, resulting in possible serious injury to any nearby personnel. 4.
Voltage checks at the timer should be accom- plished if the above checks do not identify the problem. a. Insure timer ground connection is clean and tight. b. With the truck keyswitch on, use a Volt-Ohm meter and read the voltage between "BAT (+ )" and "BAT (-)" terminals on the solid state timer. Normal reading should be 18-26 VDC, depend- ing upon whether or not the engine is running. If pressure is not correct, adjust the Pressure Reducing Valve until the pressure gauge (installed at step 1) indicates 2500 - 3000 PSI (17.2 - 20.7 MPa) grease pressure. NOTE: DO NOT EXCEED 300 PSI (2.1 MPa) on the Cylinder Pressure gauge (2, Figure 4-5). 7.
While jumper wire is installed, verify that the fol- lowing events occur in this order: a. The pump starts stroking and the LED on the flasher unit atop of SV2 flashes ‘‘On’’ and ‘‘Off’’ at approximately one second intervals. b. All of the injectors stroke down. c. Pump gets to a ‘‘stalled state’’ with no notice- able piston movement. 24 VDC Solid State Timer Adjustment The timer is factory set for a nominal 2.5 minute (off time) interval. Dwell time is approximately 1 minute, 15 seconds. A longer interval (off time) is obtained by turning the Selector Knob (3, Figure 4-7) desired time interval. 8.
Turn the keyswitch ‘‘Off’’ and remove jumper wire installed in step 5, then verify the following: a. The pressure on the Cylinder Pressure gauge (2, Figure 4-5) drops to zero (0). b. The pressure on the grease pressure test gauge (installed at step 1) drops to zero (0). c. All of the injectors reset (indicator pin up). 9. Remove grease pressure test gauge (installed at step 1). 10. At the Hydraulic Bleeddown Manifold, reconnect the Bleeddown Solenoid (disconnected in step 4). Verify that hydraulic system now bleeds down. FIGURE 4-7.
TIMER ADJUSTMENT (TOP COVER OFF) 24 VDC Solid State Timer Check To check the solid state timer operation without waiting for the normal timer setting, proceed as follows: NOTE: Set timer by turning the Selector Knob (3) to the 2.5 minute setting point. Then, turn the selector knob clockwise, one detent at a time, to the desired setting, or until the maximum limit of eighty minutes is reached. 1. Remove timer dust cover. NOTE: The timer incorporates a liquid and dust tight cover which must be in place and secured at all times during truck operation . The recommended setting is 20 minutes. ! CAUTION! The solid state timer is a sealed unit, do not attempt disassembly. 2.
Adjust timer to 5 minute interval setting.