HYDRAULIC VEHICLE RAMP (FOUR POST) Two wheel dynamometers

HYDRAULIC VEHICLE RAMP (FOUR POST) Two wheel dynamometers

Use only a ’drive on’ type ramp which supports vehicle IMPORTANT: Use a four wheel dynamometer for by its own road wheels. If a ’wheel-free’ condition is brake testing if possible. required, use a ’drive on’ ramp incorporating a ’wheel-free’ system that supports under axle casings. If brake testing on a single axle rig is necessary it Alternatively, place vehicle on a firm, flat floor and must be carried out with propeller shaft to rear axle support on axle stands. removed, AND neutral selected in BOTH main gearbox and transfer gearbox. When checking brakes, run engine at idle speed to maintain servo vacuum. If checking engine performance, the transfer box must be in high range and propeller shaft to stationary axle

TWO POST VEHICLE RAMPS

must be removed.

The manufacturer of LAND ROVER VEHICLES DOES NOT recommend using ’Two Post’ ramps that employ four adjustable support arms. These are NOT considered safe for Land Rover vehicles. DYNAMOMETER TESTING - VEHICLES WITH If vehicle is installed on a Two Post ramp ANTI-LOCK BRAKES (ABS) responsibility for safety of vehicle and personnel performing service operations is in the hands of the Service Provider.

Four wheel dynamometers

DYNAMOMETER TESTING - NON ANTI-LOCK BRAKE VEHICLES Manual.

Viscous coupling

The ABS function will not work, the ABS warning light will illuminate. Normal braking will be

The front and rear axles cannot be driven

available.

independently due to the viscous coupling. This eliminates the need for differential lock by

Provided that front and rear rollers are rotating at

progressively locking the centre differential

identical speeds and that normal workshop safety

automatically if slip occurs at any wheel.

standards are applied, there is no speed restriction during testing except any that may apply to the tyres.

• WARNING: DO NOT attempt to drive
• individual wheels with vehicle supported
• on floor jacks or stands.

Four wheel dynamometers

Provided that front and rear dynamometer rollers are rotating at identical speeds and that normal workshop safety standards are applied, there is no speed restriction during testing except any that may apply to the tyres.

WARNING: Do not attempt to test ABS function on a dynamometer

• NOTE: Before testing a vehicle on a four
• wheel dynamometer disconnect the valve
• relay. See Electrical Trouble Shooting