User Manual
Table Of Contents
- Hydraulic System Variant 260/280
- Contents
- Chapter 1 Overall hydraulic system circuit diagram
- Chapter 2 Function
- Chapter 3 Valve components
- 3.1 Main valve block – without active hydraulic system Hydraulic circuit diagram
- 3.2 Baling chamber service shut-off valve – without active hydraulic system
- 3.3 Lock-up valve unit (734)
- 3.4 Pressure relief valve (754), Baling pressure build-up solenoid valve (Y50) without active hydraulic system
- 3.5 Flow controllers (755, 756)
- 3.6 Rotor cut-out clutch Shut-off tap (627)
- 3.7 ROTO CUT knife support IN/OUT solenoid valve (Y54/Y55)
- 3.8 Main valve block – with active hydraulic system
- Index
- 0299 256.1
Hydraulic System VARIANT 260/280 TIC
54 var-h 11/04
Description of function:
Closing the tailgate –
without active pressure
control
Oil enters the valve block (6, port T) via port (801-2 B) and opens the
lock-up valve unit non-return valve (734-1).
Via port D, the pressurized oil flows to the non-return valves (732-5 and
732-6) which are unlocked. The pressurized oil flows on into the rod
spaces of hydraulic cylinders (318-1 and 318-2). The tailgate is closed.
The oil displaced from the ram spaces of hydraulic cylinders (318-1 and
318-2) flows via the unblocked non-return valves (732-5 and 732-6), the
shut-off taps (626 C and 626 D), the flow controllers (755 and 756), the
shut-off tap (627) and filter (102-1) into the tank.
The flow controllers (755 and 756) regulate the oil flow to 18 l/min. which
reduces the closing time of the tailgate as compared with the opening
time.
Closing the tailgate – with
active pressure control
1. The pilot-controlled non-return valves (732-5 and 732-6) reliably seal
off the tailgate cylinders. This is particularly important when
performing service work while the tailgate is open. The tailgate can be
closed only by building up pressure in port (801-2 B).
2. Via port (801-2 B), oil also flows into the rod spaces of hydraulic
cylinders (345, 346-1 and 346-2) in order to retract the hydraulic
cylinders quickly – the belts are tensioned. To this end, the non-return
valves (732-1 and 732-2) are opened by the oil flow.
The oil is applied at port X of the Baling pressure build-up solenoid
valve (Y55) which is electronically regulated to 90 bar during the
tailgate closing process.
The oil displaced from the ram spaces of hydraulic cylinders
(345, 346-1 and 346-2) is drained via the non-return valve (732-3), the
shut-off tap (627) and port A.
Baling Baled material pulls the hydraulic cylinders (346-1, 346-2 and 345) to the
outside by means of the tensioning arms. Baling pressure is thus built up
in the rod spaces of these cylinders; this pressure can be read at
pressure gauge (912).
The baling pressure enters valve block (6) at inlet (X) and is applied to the
Baling pressure build-up valve (Y50).
When the set baling pressure has been reached, the Baling pressure
build-up solenoid valve (Y50) opens, making oil flow via port (E) into the
ram sides of hydraulic cylinders (346-1, 346-2 and 345).
The hydraulic accumulator (513) compensates the volumetric difference
between the cylinder sides.