Bush Hog 2175 - Manual (Page 39)

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SECOND PROCEDURE
ASSEMBLY OF A GREAT BEND BACKHOE
TO A NON GREAT BEND LOADER VALVE -
OR - GREAT BEND BACKHOE TO LOADER
VALVE USING PTO PUMP KIT OPTION
Assembly of a Great Bend backhoe to a non-Great
Bend loader valve, OR a Great Bend 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 Great Bend loader valve or a non-
Great Bend 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 Great Bend loader valve. When connecting the
Great Bend backhoe valve to a loader valve other
than one obtained from Great Bend, the input pres-
sure 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 back-
hoe valve will require converting to a power beyond
valve. The power beyond pressure line from the
backhoe valve will be connected to the input pres-
●
●
sure port of the loader valve. The power beyond kit
for the backhoe being assembled must be ordered as
a separate item from Great Bend.
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.
37
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