The electric vibrators on the screed which help with the initial compaction and smoothing of a high density
mat are operated by toggle switch
Figure 38 Adjusting Screed Vibrator Intensity
from the control console. The vibrators will only operate when the paver is at full throttle and either
Track Switch is in the Travel position . This prevents extra compaction in one place on the mat when the
paver is temporarily stopped. (Note: Vibrators can be test-operated when paver is not moving by first moving
the clutch lever on the side of the engine housing to DISENGAGED position. Transmission must be in
FORWARD.) The operating intensity of each unit can be varied to produce more or less vibration. An
adjusting knob is located on the variable transformer connected to each vibrator (See Figure 38). A
recommended start-up setting is 3/4 of the range between zero and the highest dial marking.
It is important that the screed be kept in good condition so that wear, looseness, or breakage of parts does
not begin to produce poor paving results before a noticeable defect exists. The hand wheel assemblies which
adjust the screed angle must be kept in good condition. Crown adjustment and spring hanger bolts must be
kept tight. There are numerous places where wear can be compensated by shimming and adjusting. See
Maintenance Section 11 for details.
Screed Bottom With Crowning And Pull Arms
QUICK-CHANGE SCREED BOTTOM:
The asphalt finishing surface of the full floating screed should be kept in good condition. The quickchange
bottom features makes replacement of this vital part relatively easy. If all paving is done with the correct
adjustment of the pull arm "pull-point" and strike-off, and without extensive bridging when mat overlap is
required, the screed bottom will wear uniformly.
If either the leading or trailing edge does wear first, the bottom can be reversed to interchange the leading
and trailing edges.
Always replace the screed bottom before it wears completely through!
Quick-change Screed Bottom With Frame And Crowning Arms