wc_tx003253gb_FM10.fm
27
P 35A Operation
Continued from the previous page.
Note: Screeding MUST be complete before any excess moisture or bleed water is
present on the surface, and before the strips have taken an initial set.
5. Start the engine and move the throttle forward one-half to three-quarters. This
increases the engine speed to approximately 6000–7000 rpm which is
appropriate for most screeding applications.
6. Pull the screed across the concrete to perform the strike-off. A creamy liquid
should form around the edges of the screed blade as the concrete is leveled.
NOTICE: Operating the screed at continuous full throttle is not recommended.
Prolonged operation of the engine at high speed creates excessive vibration that
cannot be absorbed by the concrete. This can result in:
■ increased machine vibration
■ increased handle vibration
■ premature failure of the power unit
■ premature failure of the exciter
■ accelerated drive shaft wear
To prolong screed life, use the lowest possible throttle and exciter settings that
produce an acceptable surface finish. The proper engine speed for a given exciter
setting will produce a smooth concrete surface and limit vibration transmitted to the
machine and handles.
Troubleshooting
Follow the recommendations below if a creamy liquid does not appear while
striking off the concrete.
■ Increase engine speed slightly.
■ Increase the exciter setting one position at a time to properly vibrate the
concrete. See Exciter Adjustment.
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