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Specications
Specications
Model Numbers
Serial Nos: 850,000 and Higher
Manual Start Models: THP16KA363; THP16KA483; THP18KA523; THP16KA363CA; THP16KA483CA
Electric Start Models: THP20KAE483; THP20KAE523; THP20KAE483CA
Systems
Engine
• Engine Specications: See your Engine Owner’s
Manual
• RPM: Full Speed: 3600 (No Load)
Fuel System
• Capacity: 5.0 gal. (18.9 L)
• Type of Fuel: Regular unleaded gasoline, 87
octane or higher; containing no more than 10%
methanol or ethanol.
• Fuel Filter: Replaceable In-line
• Fuel Shut-Off Valve: 1/4 turn increments
Electrical System (Electric Start)
• Charging System: Flywheel Alternator
• Charging Capacity: 15 amps
• Battery Type: BCI Group U1
• Battery Voltage: 12 Volt
• Polarity: Negative Ground
• Fuses: Two 20 amp blade type
Safety Interlock System:
• Operator must have OPC (Operator Presence
Control) levers held in contact with handle
grips, speed control lever in neutral, and PTO
disengaged to start engine. Release of OPC levers
will cause the engine to stop if speed control lever
is not in neutral and/or PTO is engaged.
• Park brake must be disengaged to move speed
control out of neutral or engine will kill.
Operator Controls
Steering Control: Fingertip drive control levers
provide independent speed control, braking and
neutral to each drive wheel for moving forward or
reverse, stopping, and power turning.
Transmission
Twin Hydrostatic Drive
• Two Hydro Gear variable displacement high
efciency pumps independently coupled to two
high efciency Parker/Ross wheel drive motors.
• Hydraulic Oil: Use Exmark Premium Hydro Oil.
• Hydraulic Oil Capacity: 2.4 qt. (2.2 L)
• Hydraulic Filter is replaceable cartridge type.
P/N 109-4180: 25 microns, 10 psi bypass
(Summer use above 32°F (0°C))
P/N 1-523541: 40 microns, 18 psi bypass (Winter
use below 32°F (0°C))
• Speeds:
– 0-6.2 mph (10.0 km/hr) forward.
– 0-2.2 mph (3.5 km/hr) reverse.
• Drive wheels release valves allow machine to be
moved when engine is not running.
Wheel Drive System
Drive wheels are direct coupled to Parker wheel drive
motors with 1 inch (25.4 mm) tapered shaft.
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