Maintenance - Section 42 10/06 0M4206 Page 42-2 Automatic Lubrication System Hydraulic inlet pressure must not exceed 20685 kPa (3000 psi). Exceeding the rated pressure may result in damage to system components and pos- sible personal injury. Specifications are as follows: Maximum hydraulic oil inlet pressure: . . . . . . . . . . . . . . . . . . . . . . . . 20685 kPa (3000 psi) Hydraulic oil operating pressure: . . . . . . . . . . . . . . . . . . 2240-2415 kPa (325-350 psi) Hydraulic inlet flow: . . . . . . . . . . . . . . . . . . . . . . up to 28 L/min. (7 GPM) Pump ratio: . . . . . . . . . . . . . . . approx. 9:1 @ 2068 to 2415 kPa (300 to 350 psi) oil pressure = less than 7 L/min.
(2 GPM) flow FIGURE 42-2. STEERING CYLINDER AND TIE ROD INJECTORS 1. Steering Cylinder/Tie Rod Injectors 2. To Steering Cylinder Cap End Operating temperature: 3. To Steering Cylinder Rod End 4. Supply From Pump 5. To Tie Rod . . . . . . . . . . . . . . . . . . -10 to +65°C (-20 to +150°F) Reservoir Reservoir (6) has an approximate capacity of 97 kg (214 lbs) of grease. When the grease supply is replen- ished by filling the system at the service center, the grease is passed through filter assembly (14) to remove contaminants before it flows into the reservoir.
SYSTEM COMPONENTS Filter Assembly Filter assembly (14, Figure 42-3) filters the grease prior to refilling reservoir (6) from the shop supply. Dirty filter indicator (13) alerts service personnel when the filter requires replacement. Fixed Pressure Reducing Valve Pressure reducing valve (12, Figure 42-3), located on the manifold, is preset and reduces the hydraulic supply pressure from the truck steering circuit to a suitable operating pressure of 2240 - 2415 kPa (325 - 350 psi) for the hydraulic motor used to drive the lubricant pump. Hydraulic Motor and Grease Pump Hydraulic motor and grease pump (16 & 4, Figure 42-3) is a hydraulically operated grease pump.
Inte- grated pump control manifold (4, Figure 42-1) is incorporated with the motor to control input flow and pressure. The pressure reducing valve has a fixed pressure setting and must not be changed. Flow Control Valve NOTE: The pump crankcase oil level must be maintained to the level of oil fill plug (22, Figure 42- 3). If necessary, refill with 10W-30 motor oil. Flow control valve (23, Figure 42-3), mounted on the manifold, is preset and controls the amount of oil flow to the hydraulic motor at 9.5 L/min (2.5 gpm). The flow control valve has a fixed pressure setting and must not be changed.