SECTION 3
OPERATION
drum" locking position. To lock any of the four scrapers
NOTE: If the Detroit Diesel engine fails to start after the
into the "off-the-drum" position:
third attempt, check the EMERGENCY STOP
Control has been manually reset as described in
1.
Pull scraper away from the drum.
2.
Move the pawl into the lock position.
3-9.
OPERATING THE UNIT (see figure 3 -1).
3. Slowly move the scraper towards the drum
NOTE: Before operating the unit, allow the engine to idle
until the pawl holds the scraper.
at 700 RPM for approximately two minutes to
allow engine and hydraulic oil to begin to reach
WARNING:
Always use extreme caution when
operating temperature.
positioning scrapers as they are under
considerable spring tension and may
3-10. Release the park brake by pushing the control
become sharp when worn.
lever to the BRAKE OFF position (down),
3- 18.
COCO MATS (See figure 3-4).
3-11. SPEED AND DIRECTION CONTROL .
3-19. A full width COCO mat is located on each roll and
3-12. Speed and direction of the unit are controlled by
is used in conjunction with the water spray system to keep
the Direction-Throttle Bail (figure 3-1).
Move the
the rolls clean.
Direction-Throttle Bail off of "neutral" in the desired
direction (forward or reverse). To increase unit speed,
3-20. Both coca mat arrangements have "off-the-drum"
move the lever further away from the "neutral" position.
locking positions. To lock either of the two coca mats
To decrease unit speed, move the lever back toward the
"off-the-drum, ":
"neutral" position.
1.
Pull or lift the coca mat off of the drum.
NOTE: Optimum torque to the drive drum is achieved by
moving the Direction-Throttle Bail toward the
2.
Engage the mat hook in the mat link.
'`neutral" position when the engine starts to lug
down. Move bail until engine RPM increases to
3. Slowly move the coco mat towards the drum
loaded RPM speed.
until the mat hook holds the mat.
3-13. DYNAMIC BRAKING.
3-14. Slowing or stopping the unit during operation is
accomplished by moving the Direction-Throttle Bail
toward "Neutral".
WARNING: Never shut down the engine when attempting
to stop the unit. This will reduce or eliminate
all dynamic braking capabilities.
3-15. DRUM SCRAPERS (see figure 3-4).
3-16. Both Guide Rolls and the Drive roll are equipped
with full width, adjustable scrapers mounted ahead and
behind each of the drums. These scraper bars are
designed to keep the large pieces of material from
clinging to the rolls when moving in either forward or
reverse. Scrapers are spring loaded to provide positive
FIGURE 3-4.
drum contact.
3-21. WATER SPRAY SYSTEM (see figure 3-1).
3-17. All
four
scraper
bars
have
an
"off-the
3-22. The water spray system is designed to help keep
the drums clean when rolling asphalt.
To activate
3-6.