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Fav 700
Fav 900
Hydraulics / Valve fitting
Nitrogen diaphragm accumulator - STSP
E
Testing
Fav 900 chassis number 23/3001 and up
04.12.2001
9620
000002
E
a
5/5
Capitel
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Nitrogen diaphragm accumulator - STSP
PM-Picturemodule
Text-module
pSt = Control pressure (measured at measuring point M5)
Text-module
Bullet-List
Testing diaphragm accumulator - STSP
●
Start tractor and unlock control valves.
●
Control pressure of 22 bar is generated.
●
Switch tractor off (ignition OFF).
●
Provide external power source for Y032 - control pressure solenoid valve.
●
The nitrogen diaphragm accumulator feeds more oil so that the control pressure is maintained.
●
The control pressure of 22 bar gradually dissipates via the pilot valves (in the electric control valves)
and via the load-sensing line (over a period of approx. 20 min).
●
Once the pressure in the diaphragm accumulator has been relieved, the control pressure falls
quickly
Target values:
Max. accumulator pressure (diaphragm accumulator relieved) approx. 17 bar
Min. accumulator pressure (diaphragm accumulator relieved) approx. 13 bar
Bullet-List
If the accumulator pressure (diaphragm accumulator relieved) falls below approx. 13 bar:
●
internal leak in diaphragm accumulator - STSP
●
leak in non-return valve - RV7
●
leak in pilot valve of electric control valves
●
leak in load-sensing line to LS pump - PR
Note:
The time (t) in which the control pressure (pSt) falls depends on:
- the tolerances in the pilot valve (electric control valves) and in the load-sensing line
- the hydraulic oil temperature
Pressure curve at measuring point M5
PMTAB_Picture