2019 35 D4OPTRS
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SERVICE AND MAINTENANCE
BLAST ORIFICE OPENING - LOCATION & ADJUSTMENT
The blast orifi ce directs the high velocity air from the blower at an approximate 45 degree
angle to the ground. Its opening should measure 3/8 inch (9.5 mm) on the left side of the pick-
up head tapering to 5/8 inch (22.2 mm) opening on the right side. A larger opening will reduce
the velocity and a smaller opening will restrict the air volume. To adjust, loosen the eight (8)
bolts at the rear of the pick-up head and slide blast orifi ce assembly in or out in slotted holes
until proper gap is achieved. Tighten the eight (8) mounting bolts and re-measure to be sure
assembly has not moved.
NOTE: All Blast orifi ce measurements must be taken with auxiliary engine off!
BLAST ORIFICE OPENING - PROPER CLEARANCE
The blast orifi ce opening must be maintained as noted above. The distance from the
ground to the opening is also critical and must be maintained. See Cross Section Drawing
for proper ground clearance setting. Loosen fi ve (5) bolts and slide skid plate up or down
in slotted holes for proper adjustment. Removing the skid plate for this adjustment is not
necessary.
SUCTION AND PRESSURE HOSES
It is advisable to rotate the suction and pressure hoses 1/4 turn (90°) every 25-50 hours of
use to prolong their wear life. This procedure distributes “Hot Spot” wear.
CURTAIN REPLACEMENT
USE ONLY TYMCO CURTAINS FOR REPLACEMENT
1. Remove pick-up head from under sweeper. Turn pick-up head over to expose bottom
of head and curtains. Remove the screws and angle iron clamps. (Make note how
angle iron clamps are oriented so they can be reinstalled correctly.) Remove small
suction baffl e curtain near the nozzle.
WARNING: Before servicing, stop auxiliary engine and remove ignition
key or disconnect negative battery cable.
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2. Scrape off all debris accumulated on bottom of the pick-up head and wash off for
easier rebuilding.
3. If sides of pick-up head are bent, straighten as close as possible to original confi guration.
Lay new curtains in place (see Cross Section drawing.) If a curtain is a little too long,
trim equal amounts off each end until curtain lays perfectly fl at in place.
4. Before bolting curtain in place, look closely at side of curtain and notice that it is made
of a 2-ply material with a thicker layer of rubber on one side of the curtain. The thick
layer is the wear surface and should be installed oriented toward the front of the pick-
up head.
CAUTION: If sweeper is equipped with dust control system, take care not
to damage water spray nozzles on pick-up head when turning it
over.
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