Husqvarna ZTH5223, ZTH6125 manual Engine, Drive and Control, Brakes, Design And Function

Models: ZTH5223 ZTH6125

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Engine

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:

Model

Kawasaki’s

Power

Publication

engine type

Kawasaki no.

 

 

 

 

 

 

ZTH5223

FH680V-AS15

17.5 kW (23 hp)

99924-2045-03

ZTH6125

FH721V-AS04

18.6 kW (25 hp)

99924-2045-03

 

 

 

 

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

8011-507

on each rear wheel is engaged by a lever on

Air screw on hydraulic pump

the left of the mower operator. The lever and

 

the brake bands are mechanically linked.

 

English-27

Page 29
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Husqvarna ZTH5223, ZTH6125 manual Engine, Drive and Control, Brakes, Design And Function