253
Model Code Page
90. Hydraulic system
6000--8950 910 3
1. 9. 2002
1. 8. 2000
Technical data
The hydraulic system has low and high pressure circuits. Oil is supplied by a twin gear pump.
Both circuits have a common suction strainer. In addition, the high pressure circuit has a pressure filter and also the low pressure
circuit (F13130 --- ). On HiTech tractors there are two pressure filters in the low pressure circuit, one of which is a return filter.
Low pressure circuit (rearmost pump)
--- pump capacity at max. engine revs. l/min 19 (--- 658899), 23 (658900---).........................................
--- pump capacity in HiTech tractors (transmission 650) and in 6200---6550Hi
tractors (transmission 550) from ser. no. K36112 (6200 ---6400, K41106 ---)
at max. engine revs. l/min 30.........................................................
8350Hi: 1800r/min, l/min 25..........................................................
--- max. pressure (pressure---limiting valve opening pressure) 1,8 MPa (18 bar)...........................
Supplies oil for the following functions:
--- q u i c k --- s h i f t g e a r e n g a g e m e n t
--- HiTech shuttle engagement
--- 4WD engagement
--- PTO engagement
--- diff. lock engagement
--- transmission lubrication
--- oil for brake valve for trailer (optional)
--- oil to oil cooler
--- oil to disengage the hand brake on HiTech tractors.
High pressure circuit (foremost pump)
--- pump max.capacity at min. pressure and at max. engine revs. (l/min) 70 (---658899), 73 (658900---).................
--- m a x . p r e s s u r e 19 MPa (190 bar).................................................................
Hydraulic system capability at max. revs, measured at quick---action c ouplings:
--- m a x . e f f e c t ( kW) 19 ( ---658899), 20 (658900---)..............................................................
Pump safety valve opening pressure 23 MPa (230 bar)................................................
Supplies oil for the following functions:
--- steering system (priority valve)
--- hydraulic power lift
--- auxiliary hydraulics
Pressures at test points (1500 r/min, 40---65˚C)
Low pressure circuit, ---660070/660071--- 2,1---2,3 MPa/1,8---1,9 MPa............................................
High pressure circuit/free circulation pressure 19,0 ---19,8 MP a/ca. 1,5 MPa........................................
Hydraulic power lift shock valve opening pressure 20--- 21 MPa....................................
Lubricating o il pressure, mechanical Shuttle/HiTech Shuttle min. 0,03 MPa/min. 0,12 MPa............................
Oils:
Common oil for transmission and hydraulic system. Oil quality and quantity, see page 130/4.
--- min. mark, available for auxiliary hydraulics 20 l........................................
--- max. mark, available for auxiliary hydraulics 30 l.......................................
--- extra max. mark, available for auxiliary hydraulics 40 l...................................
Hydraulic power lift
Electro---hydraulic power lift (Autocontrol)
Hydraulic lift control valve
--- t y p e Bosch.........................................................................
--- shock valve opening pressure 20 MP a (200 bar)...................................................
Two external lifting cylinders:
--- Ø 80 mm (6000 ---6400, 8900, 8000).
Note! Manufacturing of power lift 40 KN (Ø 80 mm cyl.) is finished in autumn 2000.
--- Ø 90 mm (6600, 6800, 8100, 6250Hi --- 6550Hi)
--- Ø 100 mm (8200, 8400, 8050---8750, 6650Hi---8950Hi)
--- lifting cylinder working pressure max. 18,0 MP a (180 bar)..................................................
Valves for auxiliary hydraulics
Two 1/2---action valves, separate levers:
--- First valve has a mechanical position locking function.
--- Second valve has a floating pos itio n.
--- As an extra equipment can be fitted two extra valve
--- As an option oil flow control valve can be fitted (controls the first valve oil flow)
--- At the rear of the tractor there are quick---action couplings for auxiliary hydraulics. Different kind of towing devices are available.
Front power lift is also available, see pages 910/26 and 27.
T h r e e --- p o i n t l i n k a g e , c a t e g o r y 2 ;
--- telescopic lower links (6100--- 6400, 8000)
--- linkage has quick--- attaching type links (6600---8100).
--- lower links with ball type ends, category 3 (8400)
Hydraulically controlled pick---up hitch. Agricultural drawbar (optional)
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