Introduction

Use this guide to remove or replace the throttle assembly on a Wacker BS50-4AS REV 101 (2019) Vibrator/Rammer.

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    • Ensure the device is powered down and cool to the touch before starting your repair.

    • Firmly grip the base of the spark plug wire's connector and pull it away from the spark plug to disconnect it.

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    • Use a 10 mm socket to remove the bolt securing the throttle assembly's ground wire.

    • Remove the ground wire.

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    • Grip the throttle cable's black wire bullet connecter and pull to disconnect it from the engine.

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    • Grab both ends of the throttle wires and feed them out, past the metal engine guard.

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    • Use a pair of flush cutters to cut the cable tie securing the throttle wires together.

    • During reassembly, replace this cable tie.

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    • Move the throttle lever all the way into the SLOW position, towards the front of the device, to loosen tension on the throttle cable.

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    • Use a Phillips driver to remove the screw securing the throttle cable to the actuator arm on the motor.

    • You may need to use a 10 mm wrench to hold the nut in place as you remove the screw.

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    • Use an 8 mm socket to remove the two bolts securing the throttle assembly to the frame.

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    • Grip the throttle assembly from underneath and lower it down through its cutout in the frame.

    • Don't attempt to fully remove the throttle assembly yet. Let the assembly hang in place.

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    • Holding the throttle assembly in place, pull the throttle cable through the hole on the throttle lever.

    • Remove the throttle cable.

    • During reassembly, be careful not to fray the throttle cable tip, or you won't be able to install the cable.

    • During reassembly, ensure the throttle cable guide shoulder is fully recessed into its section on the throttle assembly.

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    • Place a rag or shop towel underneath the petcock fuel lines to prevent drips and spills from getting on the device.

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    • Grip one of the clear fuel tubes near where it connects to the petcock and squeeze it completely closed.

    • Pull the tube directly away from the petcock nipple to remove it.

    • This may require some force due to suction within the tubes.

    • Use a pick tool to lift one end of the tube up to break suction if needed.

    • Residual fuel in the fuel lines may leak out after the tube is removed.

    • Disconnect the second fuel tube from the petcock.

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    • Thread the throttle wires out from underneath the metal engine guard.

    • Remove the throttle assembly.

    • Only the throttle assembly remains.

Conclusion

To reassemble your device, follow these instructions in reverse order.

Carsten Frauenheim

Member since: 10/03/20

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