Buhler 535 - Manual (Page 117)

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Section 3 - Operation
Hydraulic Operation - Electro-hydraulic
Hydraulic Quick Couplers
Each remote valve section has a pair of hydraulic
quick couplers located at the rear of the tractor . These
are color-coded with the hydraulic control levers in
the cab . The couplers are self-sealing and leverless
and require no tools for connecting and disconnecting
hoses . The couplers also permit hoses to detach
themselves from the coupler should an implement
become disconnected from the tractor .
The left section couplers (2) are identified by an
“extend/raise” symbol on the couplers dust cover and
the right section (3) are identified by a “retract/lower”
symbol on the couplers dust cover .
Excess oil drain hoses (4) are attached to each coupler
to drain away oil released during connection and
separation of the couplers .
The couplers will accept standard (/2") SAE or ISO
tips . The couplers can be connected or disconnected
under pressure .
Coupler Connection
 . To connect couplers, wipe the outside of the coupler
and the tip of the implement to remove any dust
and minimize contamination .
2 . Swing the dust cover (5) aside and insert the hose
into the coupler, making sure the hose is properly
seated .
3 . Actuate the remote valve to supply hydraulic
pressure which will complete the hydraulic coupling
of the tractor and implement .
To ease removal and installation of the couplers,
relieve the pressure in the system . Securely support
the implement . Make sure no one will be injured by
moving equipment when relieving pressure in the
system . Move the control switch to the float position
with the engine running . This will relieve the pressure .
Turn the engine off with the control switch still in
float . After the engine is shut down return the control
switch to the neutral position . The couplers can now
be connected or disconnected with minimal pressure
and effort .
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