USER MANUAL SPIERINGS TRUCK AT4
AT4-EN-041115.doc
Steering:
• Axles one, two and four are steered.
• Mechanically coupled steering, where axle four is steered in the opposite direction of axle one and two,
realizing a small turning circle.
• Hydraulically powered 1-circuit steering system.
• Hydraulically powered 2-circuit steering system (serialno. 47752 and higher)
• Fitted with an emergency steering pump, so when the main steering pump malfunctions, the truck remains
steerable until it is at a standstill.
• Provisions for driving off the road:
• Axle height adjustable
- high/low gear shift transfer case can be put in low gear for driving off the road
- longitudinal and transverse differentials can be locked.
Suspension:
• Hydro-pneumatic suspension
• The suspension can be blocked (e.g. when driving with erected tower).
Braking system:
• Pneumatic brakes.
4-point outrigger system:
• Wide support base : 6.55 m x 6.15 m
• Narrow support base : 6.55 m x 5.1 m
Power supply:
The superstructure can be supplied with power in two different ways:
• External power-supply 40 kVA during erecting and folding, 40 kVA during operation.
• The truck built-in Leroy Somer 70 kVA generator for power supply to the superstructure when (sufficient)
external power is lacking.
Further data:
• Maximum speed limited to 85 km/h.
• Minimum speed at 1000 rpm: 1.8 km/h (is 30 m/min) .
• Truck weight including superstructure and counterweight 48,000 kg.
• The axle load is 12,000 kg per axle.
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