Maintenance - Section 4 OM4017.2 Page 4-22 Reciprocating Pump Automatic Lube System Pressure Reducer Adjustment: NOTE: Steering accumulator pressure is necessary to power the lube system for this procedure . 6. Reconnect the wire (step 1) to the grease pressure switch. 7. Verify that the following 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. While engine is running, and/or accumulators are charged, exercise extreme care while working in the vicinity of the grease pump! b. All of the injectors stroke down.
Stay clear of moving engine parts and do not loosen/disconnect any pressure fittings or hoses. c. The LED atop of SV2 extinguishes, but pressure remains on the pressure gauge. At this time the pump should also stop - hoses stop pulsing and pump goes quiet. Pressure on grease pressure switch should stabilize at 2,000 psi (13 790 kPa). See also NOTE below step 9. To set the Pressure Reducing Valve: 1. With engine stopped and steering accumulator pressure bled down, disconnect one wire from the N/C grease pressure switch (9, Figure 4-3, View A-A; or 10, Figure 4-7). 8. Turn the battery isolator “Off”, then verify the following: 2.
Install a pressure gauge (0 — 5,000 psi [34 475 kPa]) in the grease line downstream from the pressure switch. (The injector block on the right hand frame rail, just forward of the front suspen- sion support would be a convienent location. See 11, Figure 4-3, Detail D.) a. The pressure on the oil pressure gauge drops to zero (0). b. The pressure on the grease pressure gauge drops to zero (0). c. All of the injectors reset (indicator pin up) 3. Start the truck engine. When steering and brake pressures have stabilized, stop the engine with the emergency stop switch on the center console to prevent accumulators from bleeding down. 9.
Turn the key switch “Off” and remove jumper wire (step 4) from lube solenoid and remove pressure gauge (step 2). 4. Lift the passenger seat and connect a jumper wire between “SOL” (wire 68A) and “LUBE SW”, on the 24 VDC solid state lube timer. NOTE: If the pump appears to keep pumping and grease pressure reaches the stall out pressure (2,000 psi [13 790 kPa]), or alternatively cuts out early, the pressure switch may need to be replaced . 5. Adjust the pressure reducing valve (7, Figure 4-7) until the pressure gauge (installed at step 2) indi- cates 2,000 psi (13 790 kPa) grease pressure.