Bush Hog BH750 User Manual

Page 38

SECOND PROCEDURE

ASSEMBLY OF A BUSH HOG BACKHOE
TO A NON BUSH HOG LOADER VALVE -
OR - BUSH HOG BACKHOE TO LOADER
VALVE USING PTO PUMP KIT OPTION

Assembly of a Bush Hog backhoe to a non-Bush
Hog loader valve, OR a Bush Hog Backhoe to a
loader valve using the PTO Pump Kit option.

IMPORTANT:

Improper hydraulic hook-up can cause seri-
ous damage to the backhoe control valve,
loader valve, tractor valve, and other
hydraulic components.

The pressure supply line from the PTO pump
must be connected to the pressure inlet port
on the backhoe bulkhead connection whether
using a Bush Hog loader valve or a non-Bush
Hog loader valve. Never connect the pressure
supply line from the PTO pump to the loader
valve pressure inlet port because excessive
pressure will build up resulting in damage to
the PTO pump.

The following instructions are to be used to connect
the backhoe valve in line with a loader valve that is
not a Bush Hog loader valve. When connecting the
Bush Hog backhoe valve to a loader valve other than
one obtained from Bush Hog, the input pressure line
from the tractor will be connected to the pressure port
on the backhoe bulkhead connection first. In order to
properly plumb the system, the backhoe valve will
require converting to a power beyond valve. The
power beyond pressure line from the backhoe valve
will be connected to the input pressure port of the
loader valve. The power beyond kit for the backhoe

being assembled must be ordered as a separate item
from Bush Hog.

Assembly

1. Remove the front cover that encloses the back-
hoe valve within the control console.

2. Carefully clean the top and front sides of the
backhoe valve and remove the large “Port C”
plug located on the front of the right hand end
section of the valve.

3. Install power beyond / closed center plug inside
of port. Make sure power beyond / closed center
plug is tightly engaged.

4. Install 90° male adapter into “C” port with open
end of adapter (JIC side) oriented so that it points
down and towards the right side of the backhoe.

5. Connect hydraulic hose (supplied by customer) to
90° male adapter. The hydraulic hose should
have the same pressure rating as the original
pressure hose to the loader or other accessory
valve.

6. Connect the other end of the hydraulic hose to the
pressure port of the loader or accessory valve
using fittings (supplied by customer) as required.
Refer to Figure 24.

7. Complete assembly of the backhoe “pressure”
and “return” hydraulic hoses and a tee fitting (all sup-
plied by customer) as shown.

8. Complete assembly of the loader or accessory
valve “return” hydraulic hose (supplied by cus-
tomer) to the tee fitting as shown.

Figure 24

Remove port “C” plug and
install closed center plug
inside port.

Backhoe Valve

Return From

Backhoe Valve

Backhoe Bulkhead

Connector

To Tractor Reservoir

Port or Backhoe

Return Filter Inlet

Pressure To

Backhoe Valve

From Tractor Pressure
“Out” Port Or Outlet Port
Of PTO Pump

Loader Or

Accessory Valve

Outlet

Inlet

Return From
Loader Valve

Pressure To
Loader Valve

Pressure