Domestic Series 7000 Hydraulics; Orientation - Cub Cadet Domestic Series 7000 Service Manual

1. STANDARD HYDRAULIC SYSTEMS ON THE
DOMESTIC SERIES 7000: ORIENTATION
NOTE: Subsections 1 and 2 of the Domestic
Series 7000 Hydraulics portion of this manual
provide a basic orientation to the system. Sub-
section 3 and those that follow it contain specific
test procedures.
NOTE: Hydraulic diagrams are contained in an
apendix to this section.
1.1. The transmission housing acts as a reservoir for
all of the hydraulic systems on the tractor: hydro-
static drive pump, hydrostatic steering system,
lift cylinder, and accessories.
1.2. Fluid: the transmission and hydraulic system are
filled with 6.5 gallons (24.6 L) of Cub Cadet
Hydraulic Transmission Fluid (P/N: 737-3025
1Qt., 737-3062 1Gal., 737-3063 10 Qt., 737-
3035 5 Gal.).
1.3. Filtration: The hydraulic system filter (P/N:723-
0405) is located on a boss on the front surface of
the transmission housing, adjacent to the mid-
mount, 2000 R.P.M. P.T.O. shaft. The hydro-
static drive filter (P/N: 723-3014) is located on
the front surface of the hydrostatic pump.
See Figure 1.3.
Hydrostatic
Drive Filter
Hydraulic system
filter
Figure 1.3
NOTE: Other than sharing a reservoir, the
hydrostatic drive operates independently of the
rest of the hydraulic system.
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Domestic Series 7000

Domestic Series 7000 Hydraulics

Hydraulics
1.4. The hydrostatic drive is a Sauer model BDU15.
It has an integrated gerotor charge pump that
draws fluid up the suction pipe from the base of
the transmission housing. See Figure 1.4.
Auxiliary
pump
Hydrostatic
drive pump
Figure 1.4
1.5. The steering and lift cylinder are powered by a
Sauer-Danfoss SKP 1/4.3 S auxiliary pump.
1.6. If hydraulically powered accessories are
installed, they are driven by a second auxiliary
pump that mounts to and is driven by the stan-
dard auxiliary pump. The add-on auxiliary pump
is a Sauer-Danfoss model SNP 1/7.8 S.
NOTE: Domestic Series 7000 tractors produced
before 2004 included a single auxiliary pump as
standard equipment. Later tractors include both
auxiliary pumps and the valve used to operate a
front-end loader.
1
Second auxiliary
pump