User Manual

Hydraulic System VARIANT 260/280 TIC
26 var-h 11/04
Opening the tailgate –
without active pressure
control
Oil flows into valve block 6 (port P) via port (801-2 A), filter (102-1) and
the rotor clutch / 2
nd
belt drive shut-off tap (627).
Oil flows via the open shut-off taps (626C and 626D) into the ram spaces
of hydraulic cylinders (318-1 and 318-2), via ports (A and B) and the non-
return valves (732-5 and 732-6).
During this process, the flow rate is regulated to 50 l/min. by the flow
controllers (756 and 755).
At the same time, the lubricating oil pump (232) is supplied. Pressurized
oil is tapped directly downstream of inlet (P) of valve block (6) which
opens the lock-up valve unit non-return valve (734-1) via a ram.
The oil displaced from the rod spaces of hydraulic cylinders (318-1 and
318-2) flows through the open lock-up valve unit non-return valve (734-1)
and port (T) to the quick release coupling (801-2 B).
Downstream of the rotor clutch / 2nd belt drive shut-off tap (627),
pressurized oil flows to the rotor cut-out clutch (338) and to the drive
clutch (370) for roller 3.
The clutches open so that the rotor and the drive of roller 3 are switched
off while the tailgate is opened.
Opening the tailgate – with
active pressure control
As early as when opening the tailgate, the pressure rises to above 90 bar.
The pressure switch (Z17) opens. With this signal, the module regulates
the Baling pressure build-up solenoid valve (Y50) to 0 bar. Now the rod
spaces of hydraulic cylinders (345, 346-1 and 346-2) are pressureless
and the belts are relieved – opening the tailgate is accelerated.
Relieving the belts
(for maintenance work in
the baling chamber)
1. Switch on control box (baler CCT) so the Baling pressure build-up
solenoid valve (Y50) is energized.
2. Disengage the p.t.o. shaft.
3. Open the tailgate as far as necessary and secure it.
4. Actuate the shut-off valve (626):
The shut-off taps (626 C) and (626 D) of the tailgate are now blocked
and shut-off tap (626 E) is open.
Oil flows into valve block 6 (port P) via port (801-2 A), filter (102-1)
and shut-off tap (627).
Oil continues to flow via filter (102-2), non-return valve (732-4) and
port (E) into the ram spaces of hydraulic cylinders (346-1, 346-2 and
345) through the open shut-off tap (626 E). The cylinders extend and
the belts are relieved.
The oil displaced from the rod spaces of hydraulic cylinders
(346-1, 346-2 and 345) flows to the Baling pressure build-up solenoid
valve (Y50) via port (X). This valve is electronically regulated to 0 bar
when the tailgate is open and oil may therefore flow freely through it.
The rod spaces and the ram spaces of the belt tensioner cylinders
(346-1, 346-2 and 345) are now connected with each other.
There is the same pressure in both cylinder spaces, but since the
greater force is generated on the ram surface, the cylinders extend
and relieve the belts.