TYMCO 210 - PICK-UP HEAD ADJUSTMENT

210OPTRS 20 2008
B. PICK-UP HEAD CURTAINS
Because high velocity air is used by the pick-up head to remove debris from the pave-
ment, the pick-up head must be sealed by rubber curtains to the pavement. These rub-
ber curtains will incur wear as the pick-up head is dragged along the pavement and will
require periodic replacement. Failure to replace worn out pick-up head curtains will re-
sult in poor sweeper performance and excessively dusty conditions. Seal curtain life will
depend on pavement texture and sweeping speeds. Fast sweeping speeds increase
friction and accelerate curtain wear.
NOTE: Rubber curtain material is critical for proper wear life and sweeper perfor-
mance. Use only TYMCO replacement curtains in order to guarantee sweeper
performance. To replace curtains, refer to Parts & Service Manual.
C. PICK-UP HEAD ADJUSTMENT
1. Blast Orifice - The adjustable blast orifice assembly must be moved in such a man-
ner as to create a 5/8" (16mm) gap on the left tapering to a 3/4" (19mm) gap on the
right. Failure to adjust the blast orifice gap each time the blast orifice curtain is re-
placed will result in poor sweeper performance. (Refer to Parts & Service Manual)
2. Skid Plate Adjustment - The pick-up head is dragged on two skid plates (one on
each side of the pick-up head). These skid plates use carbide runners to prolong
their service life. The skid plates are used to adjust the height of the blast orifice from
the pavement. Refer to drawings for correct settings.
NOTE: Do Not lower skid plates in relation to the pick-up head when new curtain
set is installed in order to prevent curtain wear, as lowering skid plates
raises the blast orifice from the pavement and prevent curtains from prop-
erly sealing. Poor sweeper performance will result.
3. Pick-Up Head Spring Adjustment - Four springs are used (two on each side) to
suspend the pick-up head from the sweeper carriage. The spring suspension is de-
signed to give the pick-up head a floating effect as it is dragged along the pavement.
This serves two purposes: one, it prolongs the service life of the carbide skid plates;
two, it forms a shock absorption system that helps to protect the pick-up head from
sharp impacts. Failure to keep spring suspension system in proper adjustment will
result in premature wear of skid plates.
For proper spring adjustment, lower pick-up head and pull sweeper forward to fold
curtains under into the sweep position. With the pick-up head lowered and the
sweeper engine at idle RPM, springs should hold front of skid plates 1/2" to 3/4"
(12.7 to 19 mm) off pavement. If front of skid plates are contacting pavement, spring
tension should be increased until above description is observed. Rear of skid plates
should be set just above or lightly contacting the pavement (See Drawing). Once the
spring tension is set, increased sweeper engine speed to 2000 RPM and pull
sweeper forward. The increase in air velocity through the pick-up head should cause
pick-up head to drawn down and seal itself to pavement. The pick-up head once
drawn down should then be easily lifted by one hand which demonstrates the float-
ing characteristics desired.