Multiquip MLT25 Maintenance Trailers, Trailer Brakes, Hydraulic Brakes, Hydraulic Brake Actuator

Page 24

maintenance — TRAILERS

The following trailer maintenance guidelines are intended to assist the operator in preventive maintenance.

Trailer Brakes

Properly functioning brake shoes and drums are essential to ensure safety. The brakes should be inspected the first 200 miles of operation. This will allow the brake shoes and drums to seat properly. After the first 200 mile interval, inspect the brakes every 3,000 miles. If driving over rough terrain, inspect the brakes more frequently.

hydraulic Brakes

If your trailer has hydraulic brakes, they function the same way the surge brakes do on your tow vehicle.The hydraulic braking system must be inspected at least as often as the brakes on the tow vehicle, but no less than once per year. This inspection includes an assessment of the condition and proper operation of the wheel cylinders, brake shoes, brake drums and hubs.

Manually Adjusting the Brakes

Most axles are fitted with a brake mechanism that will adjust the brakes during a hard stop. However, some braking systems are not automatically adjusted by hard stopping. These brakes require manual adjustment. The following steps apply to adjust most manually adjustable brakes.

1.Jack up the trailer and secure it on adequate capacity jackstands.

2.Be sure the wheel and brake drum rotate freely.

3.Remove the adjusting-hole cover from the adjusting slot on the bottom of the brake backing plate.

4.With a screwdriver or standard adjusting tool, rotate the starwheel of the adjuster assembly to expand the brake shoes. Adjust the brake shoes out until the pressure of the linings against the drum makes the wheel very difficult to turn. Note:Your trailer maybe equipped with drop spindle axles. See axle manual for your axle type. You will need a modified adjusting tool for adjusting the brakes in these axles. With drop spindle axles, a modified adjusting tool with about an 80 degree angle should be used.

5.Rotate the starwheel in the opposite direction until the wheel turns freely with a slight drag.

6.Replace the adjusting-hole cover.

7.Repeat the above procedure on all brakes.

8.Lower the trailer to the ground.

Check the fluid level in the master cylinder reservoir at least every three months. If you tow your trailer an average of 1,000 miles per month in a hot and dry environment, you must check the brake fluid level once a month. The brake fluid reservoir is located on the tongue of the trailer. Always fill with clean, uncontaminated DOT 4 brake fluid.

Figure 14 below displays the major hydraulic brake components that will require inspection and maintenance. Please inspect these components as required using steps 1 through 6 as referenced in the “Manually Adjusting The Brakes” section on this page. See Table 4 for Hydraulic Brake Troubleshooting.

Figure 14. Hydraulic Brake Components

Hydraulic Brake Actuator

The hydraulic brake actuator (Figure 15) is the mechanism that activates the trailer’s brake system. This actuator changes fluid power into mechanical power.Therefore, the fluid level must be checked frequently to assure that the brakes function properly.

HYDRAULIC

BRAKE FLUID

RESERVOIR

Figure 15. Hydraulic Brake Actuator

page 24 — MLT25 sERIES LIGHT TOWER • operation manual — rev. #0 (11/28/12)

Image 24
Contents Model MLT25 sERIES Proposition 65 warning Reporting Safety Defects NhtsaTable of Contents Specifications are subject to change without noticeSafety Information SaFeTY MessagesSaFeTY sYMBOLs Addresses practices not related to personal injuryGeneRaL saFeTY LIgHT TOWeR saFeTY LaMp saFeTYTOWIng saFeTY TRanspORTIng saFeTY Loading and Tie-Down on Flatbed TruckELeCTRICaL saFeTY „ neveR operate light towerMLT25 Series Specifications Light Tower SpecificationsTrailer Specifications Generator/Engine SpecificationsDimensions DimensionsReference Letter Description Dimension Length Mast Stowed Position Length Mast Deployed PositionGeneral information Metal Halide LampsComponents Major Components Control Panel SideCircuit Breakers, 3-Pole, 15 a Turn the lamps on and off Major Components Front/RearRead all safety instructions at the beginning of manual InspectionBefore starting Check all fastening nuts and bolts for tightnessContact between the two connectors Female and Male ConnectorOperation Starting the EngineMast operation Outriggers and Support StandsRaising the Mast Raising the Mast Lowering the MastStowing the Mast to Horizontal Position Rotating the MastMove the Voltage Selector to the desired position Voltage Selector PositionsMaintenance Generator/ENGINE MaintenanceCheck Cable Wear Servicing the Mast Raise/Lower Cable SystemServicing the Mast Extension Cable System Lower the mast to the horizontal resting positionMaintenance Trailers Manually Adjusting the BrakesTrailer Brakes Hydraulic BrakesAdjustable Channel Hydraulic Brake TroubleshootingWheel Hub Adjustment Leaf SuspensionSafety guidelines Trailers COMMOn Causes for LOss of TRaILeRTRaILeR TOWIng guIDeLInes DRIvIng COnDITIOns COupLIng to THe TOW veHICLeInOpeRaBLe BRaKes, LIgHTs or MIRRORs TRaILeR TOWIng TIpsTRaILeR vIn Tag ELeCTRICaL COnneCTOR TOW veHICLeSuspensIOn sYsTeM BRaKe COnTROLLeRSaFeTY CHaIns TRaILeR LIgHTIng anD BRaKIng COnneCTORBReaKaWaY sYsTeM JaCKsTanDLock washer and hitch frame Trailer tongue. Wood or concrete blocks may also be usedCoupling the Trailer to the Tow vehicle Ball Coupler Attaching safety Chain Breakaway Brake systemBreakaway Cable surge Brake system Connecting Trailer Lights Uncoupling the Ball HitchPInTLe Hitch COupLeR Pintle Coupler and pintle HookFigure H. Attaching Safety Chain Pintle Hitch Coupling Trailer to Tow vehicle pintle CouplerTIRe saFeTY Unsafe Tires, Lug nuts or Wheels Determining Load Limit of TrailerBe sure lug nuts are tight before each tow Step Determining Load Limit of Tow vehicle stepTIRe FunDaMenTaLs Table a. speed RatingLetter Rating Speed Rating Tire safety Tips Tire RepairReplacing Worn or Damaged Tires Uniform Tire Quality grading standards uTQgsTable B. Tire Wear Troubleshooting Wheel RimsWheels, Bearings and Lug nuts Lug nut Torque RequirementsLights and signals Table C. Tire Torque RequirementsLamp Troubleshooting Symptom Possible Cause SolutionWhen switch is first Checking voltage and ballast Turned on Replacement minimizes color differencesClean fixture Lamp starts slowly ARC does not strike Defective Lamp?Lamp Troubleshooting Guide ConnectionsBallast Removal StartingElectronic components locator Wiring diagram sheet L3 NEU. GNDTB1 E1 AWG Page HERE’S HOW to GET Help