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Question 1 of 30
MRL striping trucks are equipped with two emergency stop buttons; one in the cab and one on the rear operator’s console. Â
Question 2 of 30
When the Emergency Stop button is activated it will abruptly stop the striping system equipment and the compressor engine. The chassis and safety lights will be unaffected and will still be able to operate, only the striping apparatus is shutdown.
Question 3 of 30
If the E-Stop has been activated it is recommended all striping function switches, master switch, furnaces, pumps, guns, etc. be turned off prior to resetting the E-Stop switch. It is necessary to bleed the compressed air from the air compressor receiver tank prior to re-starting the air compressor.
Question 4 of 30
Hydraulically driven rotary pumps and load hoses are used to transfer catalyst and resin from totes to material storage tanks on the truck.Â
Question 5 of 30
Three separate diesel fired heaters and circulation pumps are used to heat the catalyst and resin to proper temperature for effective impingement mixing.
Question 6 of 30
The recirculation system allows continuous flow of material from the high-pressure pumps back to material tanks when not applying material to the road.
Question 7 of 30
Recirculation helps to reduce warm-up time and keeps the system at a constant temperature when spraying is temporarily interrupted.
Question 8 of 30
Restrictor valves contain orifices that are sized to create the same pressure drop as spraying material through the guns.
Question 9 of 30
Avoid recirculating material at high pressure for long periods of time. Excessive recirculating will cause premature pump wear.
Question 10 of 30
Significant increase in resin or catalyst material pressure while recirculating indicates a plugged orifice.
Question 11 of 30
Sort the following steps in the correct sequence for clearing a clogged orifice. Â
Reorder
Turn the corresponding restrictor valve 180° to clear the orifice. The procedure may have to be repeated to clear the orifice.
Move "Turn the corresponding restrictor valve 180° to clear the orifice. The procedure may have to be repeated to clear the orifice." down
Move "Turn the corresponding restrictor valve 180° to clear the orifice. The procedure may have to be repeated to clear the orifice." up
Reorder
Determine which orifice is plugged by monitoring material pressures.
Move "Determine which orifice is plugged by monitoring material pressures." down
Move "Determine which orifice is plugged by monitoring material pressures." up
Reorder
Locate the corresponding restrictor valve at the backside of the material tanks.
Move "Locate the corresponding restrictor valve at the backside of the material tanks." down
Move "Locate the corresponding restrictor valve at the backside of the material tanks." up
Question 12 of 30
Hydraulically driven, positive displacement piston pumps provide the pressure and proper mix ratios for plural component striping materials.
Question 13 of 30
MRL recommends material pressures of at least 2500 psi for proper impingement mixing of catalyst and resin.
Question 14 of 30
At SMC, when resin pump maintenance is required, both pumps need to be rebuilt.
Question 15 of 30
The catalyst pump does not require maintenance as often due to the lack of abrasive compounds in the material.
Question 16 of 30
The high-pressure heat exchangers provide the operator with the capability to adjust material temperature and viscosities for optimum material mixing.
Question 17 of 30
Material hoses are rated for 3,500 psi working pressure and 12,000 psi burst pressure.
Question 18 of 30
There are three separate 12-volt DC electrical systems on your plural component striping truck: the chassis electrical system, an air compressor electrical system and a hydraulically driven alternator.
Question 19 of 30
The truck ignition switch must be on for the Warning lights and Video systems to be operational.
Warning lights installed on the truck are powered from this electrical system. Video systems, if installed, are also powered by this electrical system. The truck ignition switch must be on for these systems to be operational.
The compressor engine's alternator and battery supplies electrical power to the main electrical box via a 100 amp circuit breaker located in the compressor.
Chassis Electrical System
Compressor Engine Electrical System
Question 20 of 30
The timing system turns on solenoids for material guns, bead guns, blow airs, carriage lifts and some relays as applicable.
Question 21 of 30
The operator’s switch boxes provide the operator with a series of switches to control the spray guns and bead guns.
Question 22 of 30
From the options below, match the function with its description. Â
opens the ball valves; materials (resin and catalyst) flow through the valves to the MRL heat exchanger, restrictor valves and to the material tanks.
closes the ball valves stopping flow to the tanks; hydraulic oil flow to the motor on top of the high-pressure pumps is also shut off until the spray guns are turned on.
Bead guns turn on/off with the spray guns.
Bead gun on/off is adjusted to ensure full bead coverage, using the Bead +/- switches on the console.
Control operation of blow air solenoids located under the deck between the operator stations.
Glass: AUTO while in SOLID
Glass: AUTO while in SKIP
Air – Auto/Off/Test Switches
Question 23 of 30
Console switchbox controls functions for:
Question 24 of 30
Match each of the four switches ( left and right)  with its correct description below. Â
used for centerline carriage guns (#1 yellow, #2 yellow and #3 white).
are used for edgeline carriage guns.
Four switches to the left of center
Four switches to the right of center
Question 25 of 30
Match the term with its correct description below.
will normally be 0.2 to 0.5 feet longer than desired actual length of the applied stripe. This is because the gun turns off faster than it turns on.
is the distance from start of a skip to start of the next skip.
should match the CYCLE setting exactly. If it doesn't, the Skipline calibration needs to be checked.
is the default display when the Master switch is turned on. Truck speed is displayed in the upper right-hand corner of the STRIPE/CYCLE display.
Question 26 of 30
To get bead coverage on the end of solid lines set the bead gun to TEST until after the spray gun is shut off.
Question 27 of 30
Match the term with its correct description below.
Check oil level on a daily basis and fill with clean AW46 grade
hydraulic oil as necessary to maintain proper level.
a critical component in keeping your hydraulic system operating at the proper temperature.
Lateral extension of the gun carriages is controlled by hydraulic cylinders and the orbitals (steering wheels at the operator's stations.)
Gun carriage extension cylinders
Question 28 of 30
The air system provides compressed air for:
Question 29 of 30
Match the term with its correct description below.
All bead tanks are equipped with a particulate filter (5 micron) that will
remove most of the water from the compressed air.
High velocity compressed air creates a vacuum as it passes through this. The vacuum is used to transfer beads from the tote or drum into the bead tank.
used to secure the load hose to the bead tank fill port while loading beads. The camlocks must be completely rotated against the coupling body to ensure it is properly secured.
a long cylindrical tube located below the striper deck, is used to reduce the noise associated with the discharge of air from the venturi.
Question 30 of 30
Match the term with its correct description below.
Provides digital readout of material temperatures and set-points.
Provides digital readout of the glycol system temperature and set-points.
Provides power to operate solenoid valves located on the hydraulic pressure block inside the console. The hydraulic solenoid is energized when one of the CIRC/PAINT switches is in CIRC, or when in PAINT, SOLID, SKIP or START.
Controls hydraulic pressure applied to material pump hydraulic cylinder.
Indicates pressure applied to the material pump hydraulic cylinder.
Indicates bead supply pressures and allows air pressure adjustment. Refer to tank-mounted gauge for actual pressure in tank.
Switch controls purge air for cleaning gun tips.
Material Temperature Controllers
Glycol Temperature Controllers
Hydraulic Control Switches
Pressure Reducing Valves (PRV)
Hydraulic Pressure Gauges
