ALSTOR 822 - Releasing the Parking Brake

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Instruction manual
OPERATION
850/850 H/851
2.4 TOWING AND RECOVERING THE MACHINE, 850/850 H/851
If asituation occurs requiring towing of the Alstor 850/850H/851, the hydrostatic drive train must be disengaged by opening two
bypassvalves to allow the oil to circulate, and the automatic parking brake should be released.
WARNING! When the bypass valve is open and the brake is released, the machine will have no brakes and consequently
willroll freely. As aresult, perform towing with great caution.
WARNING! Towing may only take place at low speed and over short distances, at max. 3 km/h and max. 200 metres,
forfurther transport on atrailer, etc. Higher speeds or longer distances may damage the hydrostatic drivetrain.
Whenever possible, set the crane in the parked position and remove any load before towing the machine.
Always maintain asafe distance and be aware of the risk of overturning.
NOTE: The bypass function must be deactivated before starting the machine.
Activation of the bypass function
(execute on both the upper and lower screw):
■
Switch o the engine.
■
Open the engine bonnet and dismantle the undercover.
■
Dismantle the hydraulic oil expansion vessel/ller tank.
■
Loosen the lock nut (1) by turning it half aturn anti-clockwise.
■
Use an Allen key to insert the screw (2) in aclockwise direction
until resistance increases. Then screw it in half aturn more. Tighten
the lock nut (1) in aclockwise direction to atorque of 22 Nm.
Releasing the parking brake:
■
Tilt the cab.
■
Release the automatic parking brake by screwing the nut,
which adjusts the position of the brake arm, 2 turns in an anti-
clockwise direction. (3)
■
For the towing strap attachment points, see 822/834 on page 30.
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