Pressure
filter
Pressure test point
949
Model Code Page
61. Steering system
8. 11. 1990
6000--8750 611 1
Reconditioning steering system
Steering valve
(Op. no. 611)
A. Measuring steering system pressure
(pressure---limiting valve opening pressure)
1. Start the engine and allow it run until the oil temperature in
the transmission is 50---65 ˚C.
Note! Oil warms up faster if the steering wheel is held against
lock.
2. Connect a pressure gauge (measuring equipment, see
page 610/3) to the pressure test point (V almet HPR) on the
pressure filter bracket.
3. Run engine at 1500 r/min.
4. Turn the steering wheel to full lock and hold. The correct
pressure gauge reading is 14,0---15,5 MPa (140---155 bar).
Note! If the pressure value is not correct, remove the steering
valve (see instr. D) and inspect the pressur e limiting valve
(see instr. E).
B. Checking shock valve opening pres -
sure
1. Disconnect one of the oil lines to the steering cylinder and
connect a hand pump and a pressure gauge to the discon-
nected hose (measuring equipment 610/3).
Note! It is easier to disconnect the hose if the tractor is driven
sothat one front wheel is upper that the other (axleoscillation).
2. Pump up pressure and read off the shock valve opening
pressure. The correct value is 19,5---21,5 MPa (195---215
bar).
3. Completely re---assemble the system and check the open-
ing pressure in the other line to the steering cylinder.
Note! If opening pressure is not correct, remove the steering
valve (see instr D) and check and clean the shock valvesand
adjust them (see instr. E).
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