Bush Hog BH750 - Manual (Page 31)

General Description
The PTO Pump Kits consist of those parts required
to power the backhoe from the tractor’s PTO shaft.
They include the PTO pump (6 or 8 gpm) and
adapter, reservoir, filtration system, hydraulic hoses,
and fittings. In addition, they include a torque plate
that straddles the tractor’s draw bar and keeps the
pump from turning with the PTO shaft.
NOTE - The speed of backhoe operations increases
as PTO speed increases.
ASSEMBLY
IMPORTANT - When installing fittings, always
use a paste-type thread sealant on perrmanent
connections such as NPT (pipe) threads. DO
NOT use Teflon tape as thread sealant. DO NOT
use thread sealant on union ends of adapters.
DO NOT over-tighten fittings - they can split or
expand causing hydraulic fluid leakage.
Please refer to Figure 18 as a guide for assembly of
the PTO Pump Kits.
1. Assemble reservoir (16) to backhoe using 3/8” x
1” bolts (2), flat washers (5), lock washers (7), and
hex nuts (10).
2. Assemble 1” street elbow (34) to fill port on top of
reservoir, orienting elbow so that it faces right rear of
backhoe. Connect fill tube (17) to street elbow.
Figure 17
Backhoe Mainframe
Upper Brace
Upper Bar
Tractor Upper
Link Bracket
Link Weldment
Tractor Lower Link
C
Elbow may have to be rotated slightly to allow fill
tube to be installed so that its open end is located
just behind foot platform to right of operator’s seat
tower. Install breather cap with dipstick (18) onto fill
tube.
3. If filter element (35) is not already attached to filter
base, apply a thin layer of hydraulic fluid to the rub-
ber seal on the filter element and then screw it onto
the filter base. Hand tighten the element until it just
seats on the filter base, then tighten an additional
3/4 of a turn. Use this same procedure when replac-
ing filter element.
NOTE - Change filter element every time oil is
changed.
4. Assemble 90° adapter fitting (27) to inlet port of fil-
ter base and orient so that free end of fitting will
point towards backhoe and angled slightly down-
ward from horizontal. Assemble small 90° beaded
tube fitting (26) to outlet port of filter base and orient
so that free end of fitting will point towards backhoe
and angled about 30° upward from horizontal.
Connect filter assembly (15) to left rear corner of
backhoe foot platform using 1/4” x 3/4” bolts (1), flat
washers (4), and lock washers (6) - flow direction
arrow on filter base should point toward rear of back-
hoe. DO NOT over-tighten bolts as this will strip the
threads on filter base.
5. Assemble on 90° JIC adapter fitting (28) to
“Out/Return” port of bulkhead connection and an
30
PTO PUMP KITS (Optional)