500XOPTRS 28 2008
SERVICE AND MAINTENANCE
WARNING!
Before servicing, stop auxiliary engine and remove ignition key or
disconnect negative battery cable.
PICK-UP HEAD SETTING AND ADJUSTMENT
Skid plates - the skid plate setting for the TYMCO REGENERATIVE AIR pick-up head is critical
for proper sweeper performance because it determines the relationship of the blast orifice to
the pavement. Skid setting becomes even more critical with the broom assist pick-up head. If
the skid plates are lowered, this raises the blast orifice further from the road surface making the
air blast weaker against the pavement resulting in poor sweeping performance. Also the lower
the skid setting, the less reach the BAH broom has beyond the bottom of the skid plates. There
-
fore, the recommended skid plate setting for the BAH pick-up head is that the rear of the skid be
no lower than 2" below the side plate of the pick-up head. (See drawing M01790, Page 31).
With the skid plate is set in the normal debris setting, maximum reach of the broom beyond the
bottom edge of the skid plates is 1-1/2 inches. This should be more than enough reach to clean
most sweepable road surfaces.
A. Skid Plate Alignment
1. Install skid plates onto pick-up head according to the dimensions given in drawing
M01790, Page 31. Tighten only the front and rear bolts. This is not the final step!!
2. With the pick-up head in the UP position, mark the link attached and disconnect the
four flotation springs from their chains.
3. Lower the pick-up head onto an even floor surface and pull the sweeper forward to
fold under the seal curtains on bottom of the head.
4. Try to rock the head to see if it is setting evenly on the skid plate carbide runners.
Go to opposite side and check again. If little or no rocking (less than 3/16"), raise
pick-up head, re-attach springs and go to spring adjustment section.
5. If the head rocks (most do), then go to the left hand skid and adjust out the uneven
pick-up head by lowering the front or rear of the skid. Do not lower skid more than
1/2" from the normal setting.
6. Once the skid plates are aligned so that the pick-up head rides evenly on the skid
plate runners, tighten all skid plate bolts securely. Next, the head flotation springs
must be properly adjusted to prevent uneven wear on the runners.
B. Spring Adjustment - Refer to Drawing M01791, Page 32
1. Springs are adjusted each time new curtains are installed or uneven wear of the skid
plates is noticed. Improper spring tension will result in premature wear of the skid
plate runners and cause everything from poor performance to excessively dusty con-
ditions. Should the skids be observed to wear unevenly, the BAH head incorporates
symmetrically designed skid plates which can be rotated from one side to the other;
however, this does not correct the cause of the uneven wear. Only the proper spring
adjustment will result in proper wear of the skid plate runners.
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