Hydraulic Oil Pump Test

Hydraulic Test Program - Hydraulic Oil Pump Test

Preparation for Test
1. Check oil level in oil reservoir, correct if necessary.
2. Unscrew connecting rods (54, 55) at front and rear leveling valve levers (set levers to neutral position).
3. Depressurize rear axle hydraulic system by slowly opening bleeder screw (3p). Connect drain hose and place into container.
4. Connect test gauge to rear axle leveling valve bleeder screw (S2).
5. Set both leveling valve levers to position "F" (fill).
6. Open pressure supply screw (50a) by maximum of 1 turn.
7. Disconnect return line (T) at oil reservoir (2) and using a suitable hose, hold it in a measuring glass.


Special Tools








To perform this test, the oil fill quantity must be increased by 0.5 liters. If the oil reservoir was empty, the hydraulic oil pump must first be bled by disconnecting the high pressure flexible hose at the steel line. Run the engine and hold the hose into a container until the oil exits free of bubbles.


Component Locations Model

Figure 1:

2 Hydraulic oil reservoir
3 Rear axle leveling valve
3p Bleeder screw
6 Front axle leveling valve
6p Bleeder screw
50a Pressure supply screw
54 Front axle connecting rod
55 Rear axle connecting rod
T Return line - oil reservoir distributor/valve unit

Test:

Figure 2:

A Version 09/92
3m Connection fitting
3p Bleeder screw
B Version 10/92
3p Bleeder screw

Figure 3:

Version 10/92
3 Rear axle leveling valve
3p Bleeder screw
Arrow Closing screw

Figure 4:

Version 08/90
50a Pressure supply screw