Valtra 6850 - Page 986

929
Model Code Page
61. Steering system
15. 5. 1996
6000--8750 610 1
15. 5. 1993
Contents
General (Op. no. 610)
Technical data 1...................................................................
Special tools 2....................................................................
Steering system, description 4.......................................................
Steering valve 6...................................................................
Priority valve 8....................................................................
Steering cylinder 11.................................................................
Fault tracing 12....................................................................
Reverse drive controls 14............................................................
Reconditioning steering system
Steering valve (Op. no. 611):
A. Measuring working pressure of steering system 1....................................
B. Measuring shock valve opening pressure 1.........................................
C. Steering circuit leakage check 2...................................................
D. Removing steering valve 2........................................................
E. Reconditioning shock valves and pressure---limiting valve 3...........................
F. Changing seals in steering valve 4.................................................
G. Fitting steering valve 6...........................................................
Priority valve (Op. no. 612):
1. Cl eaning priority valve:
A. Disassembling priority valve 1.....................................................
B. Assembling priority valve 1.......................................................
Steering cylinder ( Op. no . 613):
1. Changing steering cylinder seals:
A. Removing steering cylinder 1.....................................................
B. Changing oil seals on RH side end piece 1..........................................
C. Changing oil seals on LH side end piece 2..........................................
D. Fitting steering cylinder 3.........................................................
Adjustments:
A. Adjusting toe---in 3..............................................................
B. Adjusting steering loc k 4.........................................................
Technical data
Hydrostatic steering system. Oil is supplied to the steering system from the high---pressure pump via the priority valve. Adjustable
telescopic steering wheel column. One double---action steering cylinder in the middle of the front axle.
Steering valve Orbitrol OSPC 125 LS.................................................................
Pump capacity per revolution 0,125 l....................................................
W o rking pressure (at pressure---test point, 1500 r/min / 50---65˚C) 14---15,5 MPa.....................
Pressur e---limiting valve opening pressure 14 MPa.........................................
Shock valve opening pressure 19,5---21,5 MPa...................................................
Priority valve:
--- 6000---8400 OLS 80.................................................................
--- 8050---8750 OLS 120.................................................................
Steering speed over 2 rounds/sec. at idling speed................................................................
Steering wheel rotates 5,2 turn..........................................................
Steering capacit y ±30˚ with front axle load of 5000 kg on dry asphalt
Turning radius (m) with standard track width:
Tractor 6100 6300---6400 6600 8000 8100 8400
Tyres 12.4---24 13.6---24 14.9R24 14.9R24 13.6R28 16.9R28
Turning circle 4,0 m 4,2 m 4,7 m 5,1 m 5,1 m 5,5 m
Toe --- i n 0 --- 5 m m.........................................................................
Suction strainer filtering properties 125
m..................................................
Pressure filter, degree of separation
β10=75.................................................