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DESIGN AND FUNCTION
Engine
Husqvarna’s ride-on mowers for professional users have two-cylinder, air-cooled engines from Kawasaki.
Major engine repairs are not covered in this workshop manual. Users are referred to Kawasaki’s own
manuals. These contain detailed information on the adjustment and repair of the engines. The manuals can
be ordered from authorized service workshops.
The table below shows the information to be quoted when ordering engine manuals:
When repairing engines, use genuine spare parts only. The warranty will be invalidated if other parts are
used.
Drive and Control
Via a belt, the engine supplies direct, clutchles, drive to two hydraulic pumps. The pumps have axial
pistons.
Each pump feeds oil to a fixed (non-adjustable) hydraulic motor (one by each drive wheel). The rate and
direction of oil flow is steplessly adjusted (via a mechanical linkage) by the motion control levers.
Adjustment is actuated by a swash plate that regulates the stroke length of the hydraulic pistons. The swash
plate is an integral part of each pump. The mower can be made to turn or reverse by controling the rate and
direction of flow to the hydraulic motors. The hydraulic motors control the speed and direction of the drive
wheels. To swing the mower around its center, simply drive one wheel forwards and the other backwards.
Hydrostatic braking occurs whenever there is no flow of oil from the pumps.
Instructions for the repair of the hydraulic pumps are given in the “Hydro-Gear BDP-10A/21L Service &
Repair Manual”.
Brakes
Hydrostatic braking (see “Drive and Control”)
provides brake control when the mower is
being powered by its engine. Putting the
motion control levers in the neutral position
brakes the mower. To move the mower
manually, open the air screws on the
hydraulic pumps. Oil is then circulated by the
hydraulic motors and the machine can be
moved short distances at low speed.
The mower also has a park brake. This
operates on both rear wheels. A brake band
on each rear wheel is engaged by a lever on
the left of the mower operator. The lever and
the brake bands are mechanically linked.
Model
Kawasaki’s
engine type
Power
Publication
Kawasaki no.
ZTH5223 FH680V-AS15 17.5 kW (23 hp) 99924-2045-03
ZTH6125 FH721V-AS04 18.6 kW (25 hp) 99924-2045-03
8011-507
Air screw on hydraulic pump