Exmark NAV20KC - Manual (Page 19)

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2.7 HYDROSTATIC GROUND DRIVE SYSTEM
2.7.1 Hydrostatic Pumps: Two Hydro Gear variable displacement piston pumps.
2.7.2 Wheel Motors: Hydro Gear planetary reduction motors.
2.7.3 Hydraulic Oil Type: Use Mobil 1 15W-50 Synthetic Motor Oil.
2.7.4 Hydraulic Oil Capacity: 4.0 qt. (3.8 L.)
2.7.5 Hydraulic Filter: Replaceable cartridge type.
P/N 109-0071: 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))
2.7.6 Speeds: 0-7.0 mph (11.3 Km/hr) forward
0-5.5.mph (8.6 km/hr) reverse
2.7.7 Drive wheel release valves allow machine to be moved when engine is not running.
2.8 TIRES Drive Front Caster Rear Caster
Pneumatic (Air-Filled) Semi-Pneumatic Semi-Pneumatic
Quantity 2 2 1
Tread Multi Trac C/S Smooth Smooth
Size 18 x 10.50-10 8 x 3.00-4 13 x 8.00-6
Ply Rating 4
Pressure 15 psi (103 kPa)
2.9 MOWER DECK (Sold Separately)
2.9.1 Models CD42CD CD48CD
Discharge Center Discharge Center Discharge
Cutting Width 42 in. (106.7 cm) 48 in. (121.9 cm)
2.9.2 Deck Drive: Clutching belt on horizontal engine shaft. Dual “A” section hexagon
belt with spring tensioned idler to jackshaft and blower. Heavy-duty cast iron,
spiral bevel gearbox is final drive to blades.
2.10 DIMENSIONS Without deck With 42” Deck With 48” Deck
Overall Width 42.6” (108.2 cm) 43.2” (109.7 cm) 49.2” (125.0 cm)
Overall Height 51.2” (130.0 cm) 51.2” (130.0 cm) 51.2” (130.0 cm)
Overall Length 67.3” (170.9 cm) 91.8” (233.2 cm) 94.5” (240.0 cm)
Curb Weight 850 lbs (386 kg) 1145 lbs (519 kg) 1170 lbs (531 kg)
Tread Width
(Center to Center of Drive Wheels) 32.7” (83.1 cm)
Wheel Base
(Center of Drive Wheel to Center of Rear Caster Wheel) 44.2” (112.3 cm)
2.11 TORQUE REQUIREMENTS
Bolt Location Torque
Blade Mounting Bolt.....................................................85-110 ft-lbs. (115-149 N-m)
Engine Mounting Bolts ......................................................30-35 ft-lbs. (41-47 N-m)
Wheel Lug Nuts .............................................................90-95 ft-lbs. (122-129 N-m)
Wheel Motor Mounting Bolts............................................72-77 ft-lbs. (98-104 N-m)
3. OPERATION INSTRUCTIONS
3.1 CONTROLS
3.1.1 Familiarize yourself with all controls before operating the mower.
3.1.2 Steering and Motion Control:
Speed Control lever, located on RH console, sets maximum forward speed.
Moving speed control lever rearward to the neutral position places the drive
system in neutral.