Load Sensing - Maximum Pressure (No Flow) - jcb 214e Service Manual

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Section E Hydraulics Section E
5 - 9 Circuit Descriptions 5 - 9
Hydraulic Pump - Variable Flow
Pressure/Flow Regulator Valve

Load Sensing - Maximum Pressure (no flow)

5
When a service ram reaches the end of its stroke or the
service meets resistance (for instance tearing out), the signal
6
pressure from the loader (or backhoe) valve 13 will increase
4
to the same pressure as pump output pressure.
12
The force of spring 6 is sufficient to move spool 4 down. The
pressure in the system is also sufficient to move spool 3 up
3
against the force of spring 12, this creates a connection from
the pump outlet to control piston 7 via port A.
P A T
Cont rol p ist on 7 moves t hus d ec reasing t he angle of
swashplate 2. Pump output flow now decreases whilst the
system pressure is maintained at maximum setting. There is
7
now no flow but maximum system pressure.
2
1
A275780
9803/3280 Issue 1
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