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Valtra 6100 User Manual

Valtra 6100
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Lowering
valve
Shock valve
Lowering valve
pilot piston
3 --- way oi l f l ow re g u l a -
ting slide
Main spool
1248
Model Code Page
90. Hydraulic system
1. 8. 2000
6000--8950 912 2
15. 5. 1996
D. Reconditioning control valv e
Lowering valve
If the hydraulic power lift makes many lifting corrections(reac-
tions) per minute when a weight is attached to thethree---point
linkage, a possible fault can be faulty lowering valve (or its
pilot piston).
In this case, the lowering valve can be disassembled and
cleaned as well as the pilot piston. Leaking lowering valve
must be changed. In addition, the valve spring must be
checked and changed. Note! If the lift does not hold the load,
possible fault can also be leaky lifting cylinder piston seal.
Shock valve (20 MPa)
If the lift does not hold the load, the possible fault can also be
leaking shock valve. When the control valve is in neutral posi-
tion, the load rests on the shock valve.
In this case, open and clean the shock valve and, if necessary,
change the valve spring or adjust it with shims.
3---way oil flow regulating valve
This valve can be opened and cleaned. The valve slide must
move easily in its bore.
Pilot pressure limiting valve
Note! The new pilot valve has neither a ball nor a spring but
only a tapered valve pin and a locking nut.
The valve must not be screwed fully home, it must be opened
1/2---1 turn.
Adjusting pilot pressure:
Connect a pressure gauge to the pressure filter test point. Ac-
tivate the power lift and adjust the engine revs to 1500 rpm.
Turn the position potentiometer to lowering. Now the free cir-
culation pressure must rise 5 bar, e.g.: not activated 20 bar
and activated 25 bar.
The tighter the valve is, the greater is the lowering speed (if the
valve is tightened too great, the free flow pressure rises too
much in the lowering movement). If the valve is too loose, the
lower links do not lower at all (lowering valve does not open).
Solenoids
Solenoid valves are available as a spare part. When fitting a
new solenoid, fit the same shims onto the end of the main
spool spring. Do not tighten the solenoid screws too hard.
Tightening torques
Shock valve plug 46 Nm........................
Lowering valve plug 30 Nm......................
Pilot piston plug 103 Nm.........................
Note! When reconditioning the control valve, always fit new
sealing rings. When opening the valve plugs, use good tight
Allen keys because the plugs can be very tight. When
slackening the plugs, knock at the Allen keys with a hammer.

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Valtra 6100 Specifications

General IconGeneral
BrandValtra
Model6100
CategoryTractor
LanguageEnglish

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