Midland SIDE DUMP GRAVEL TRAILER Operator's Manual
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Midland SIDE DUMP GRAVEL TRAILER Operator's Manual

Midland SIDE DUMP GRAVEL TRAILER Operator's Manual

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SIDE DUMP
GRAVEL TRAILER
OPERATOR'S MANUAL

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Summary of Contents for Midland SIDE DUMP GRAVEL TRAILER

  • Page 1 SIDE DUMP GRAVEL TRAILER OPERATOR’S MANUAL...
  • Page 2 Dealer’s Rep. Signature: The above equipment and Operator’s Manual has been received by me and I have been thoroughly instructed and understood as to care, adjustments, safe operation and applicable warranty policy. Date: Owner’s Signature: WHITE PINK YELLOW MIDLAND DEALER CUSTOMER...
  • Page 3 Midland Manufacturing Limited's dump equipment. Although the information in this manual was current on the date of issue, Midland Manufacturing Limited reserves the right to effect changes as the need occurs without notice or liability.
  • Page 5 Midland Manufacturing Limited (hereafter referred to as “Midland”) warrants directly to you, the first retail customer; that each new trailer manufactured by Midland is free from defects in material and workmanship; provided that the trailer is being properly maintained; and that the trailer is being used in it’s normal intended service free from accident or collision.
  • Page 6 Any trailer or component of a trailer that has been altered (other than by Midland) in any way so as in the judgement of Midland; to affect its operation or reliability, or which has been subject to misuse, neglect or accident.
  • Page 7 While Midland undertakes to make reasonable efforts to resolve every warranty claim, if Midland does not accept as valid all or any part of a particular claim, then Midland will only be responsible under this warranty for such claim if it is enforced by legal action commenced within one year from the date that the breach of warranty occurred.
  • Page 9 COMPLIANCE PLATE LOCATION The trailer compliance plate is mounted where indicated on the trailer, verifying compliance with all applicable Canadian and United States Motor Vehicle Safety Standards and discloses the Gross Vehicle Weight Rating (GVWR) and Gross Axle Weight Rating (GAWR). This plate also has the trailer Serial Number recorded and the date of manufacture.
  • Page 10 V.I.N. PLATE LOCATION Always give your dealer the V.I.N. (Vehicle Identification Number) of your Midland End Dump Trailer unit when ordering parts or requesting service or other information. The plate is located where indicated. Please mark the number in the space provided for easy reference. Also obtain and mark down the Model Number, Production Year and other pertinent information of your Trailer unit in the spaces provided.

  • Page 11: Table Of Contents

    TABLE OF CONTENTS SECTION DESCRIPTION PAGE Introduction ............1 Safety ...............2 General Safety ............3 Operating Safety ............4 Maintenance Safety ..........4 Hydraulic Safety ............5 Travel Safety .............5 Loading Safety ............5 Tire Safety ..............6 Safety Signs/Decals ..........6 Sign-Off Form ............7 Safety Sign (Decal) Locations ........8 Operation Guidelines ..........10 To the New Operator or Owner .......10 Terminology ............11...
  • Page 12 TABLE OF CONTENTS SECTION DESCRIPTION PAGE Periodic Maintenance and Adjustments ....45 5.2.1 Torque Specification Summary .......45 5.2.2 Kingpin and Oscillating Fifth Wheel Plate ....47 5.2.3 Fifth Wheel ..............48 5.2.4 Axle Alignment ............49 5.2.5 Wheel Hubs/Bearings ..........51 5.2.6 Wheels ..............55 5.2.7 Tires ................57 5.2.8 Brakes ..............59...

  • Page 13: Introduction

    INTRODUCTION Midland Manufacturing appreciates having you for our customer and trust this unit will give you many years of trouble-free use. We are pleased to have you join a growing number of operators pulling Midland trailers. We take pride in building products to meet the demands of a discriminating buyer in the transportation industry.

  • Page 14: Safety

    The Safety Alert symbol identifies ATTENTION! BECOME ALERT! important safety messages on the YOUR SAFETY IS INVOLVED! Midland Trailer and in the manual. When you see this symbol, be alert to the possibility of personal injury or death. Follow the instructions in the safety message.

  • Page 15: General Safety

    • Midland feels that a person who has not read, moving parts to stop and all air pressure to be understood and been trained to follow all fully exhausted before servicing, adjusting or operating and safety instructions is not qualified repairing.

  • Page 16: Operating Safety

    Lower landing gear and and all safety signs before operating or adjusting provide extra support if the ground is soft. Do the Midland Trailer. not unhook if trailer is loaded. 2. Do not allow riders on any part of the trailer 14.

  • Page 17: Hydraulic Safety

    HYDRAULIC SAFETY TRAVEL SAFETY 1. Read and understand all the information in the 1. Make sure that all components in the hydraulic operator’s manual regarding procedures and system are kept in good condition and are clean. safety when operating the Trailer unit in the field or on the road.

  • Page 18: Tire Safety

    TIRE SAFETY 1. Failure to follow proper procedures when mounting a tire on a wheel or rim can produce an explosion which may result in serious injury or death. 2. Do not attempt to mount a tire unless you have the proper equipment and experience to do the job.

  • Page 19: Sign-Off Form

    Midland Manufacturing follows the general Safety Standards specified by the Society of Automotive Engineers (SAE) and the Occupational Safety and Health Administration (OSHA). Anyone who will be operating and/ or maintaining the Midland Trailer must read and clearly understand ALL Safety, Operating and Maintenance information presented in this manual.

  • Page 20: Safety Sign (Decal) Locations

    SAFETY SIGN (DECAL) LOCATIONS The types of safety signs and locations on the equipment are shown in the illustration below. Good safety re- quires that you familiarize yourself with the various safety signs, the type of warning and the area, or particular function related to that area, that requires your SAFETY AWARENESS.
  • Page 21 The types of safety signs and locations on the equipment are shown in the illustration below. Good safety re- quires that you familiarize yourself with the various safety signs, the type of warning and the area, or particular function related to that area, that requires your SAFETY AWARENESS. •...

  • Page 22: Operation Guidelines

    TO THE NEW OPERATOR OR OWNER It is the responsibility of the owner and operator The Midland Side Dump Gravel Trailers combine to be familiar with the weight and loading of your light weight construction methods and high strength trailer or combinations of trailers.

  • Page 23: Terminology

    TERMINOLOGY TERMINOLOGY The Midland Side Dump Trailers are designed with The Midland Side Dump Trailers are designed with hydraulic cylinders at the front and rear of the tub hydraulic cylinders at the front and rear of the tub to lift and tilt for unloading. Each side of the tub is to lift and tilt for unloading.

  • Page 24: Break-In

    BREAK-IN Break-in is the most important time in a Trailer's life. It is critical that the unit be checked frequently during the first 5000 miles to be sure that all components and systems are properly adjusted and performing as required. The following inspection schedule is provided as a guide for normal operating conditions.
  • Page 25 BREAK-IN (cont'd) 6. Suspension b. Fifth Wheel Assembley: The fifth wheel assembly consists of the king A suspension system connects the axles to the pin locking mechanism, surface plate, frame, frame. All fasteners must be maintained at their pivot and anchor system. Check that the king specified torque to ensure that all clamping and pin locking mechanism locks and unlocks anchoring forces remain intact.

  • Page 26: Controls

    CONTROLS Before starting to work, all operators should familiarize themselves with the location and function of all controls. 1. Hydraulic System: Each customer must provide controls in the tractor cab for operating the trailer. a. Requirements: The trailer requires a 30 gpm oil supply at 2500 psi to operate the tub cylinders.
  • Page 27 CONTROLS (cont'd) 2. Tank Drain Valve: Every air reservoir tank on the trailer is equipped with a spring-loaded valve that is used to drain the moisture. These valves are attached to a cable that extends out to the frame to allow the operator to drain moisture from the tanks.
  • Page 28 CONTROLS (cont'd) 3. Latches/Pivots: Each side of the frame is designed with 2 latches/ pivots to control the motion of the tub when unloading. Each anchor has a pinned latch that holds or releases the pivot. Location Latched Fig. 5 LATCHES/PIVOTS...
  • Page 29 CONTROLS (cont'd) 4. Landing Gear: A drop leg type or manual position landing gear is available for your trailer. a. Drop Leg Type: The drop leg type landing gear consists of an anchor bracket and extendable leg. To extend leg, pull the pin and let the leg drop down to the ground.

  • Page 30: Pre-Operation Vehicle Inspection Procedure

    The tractor items, part of the Department of INSPECTION PROCEDURE Transport (D.O.T.) walk around sequence, have been omitted. The safe and trouble-free use of a Midland Trailer requires the operator to maintain the unit in good operating condition. To assist the operator, a pre- WALK AROUND SEQUENCE operation checklist is provided that should be followed each time before the trailer is used.
  • Page 31 PRE-OPERATION (cont'd) failures of valves and components. Traces of these products will void any warranty consideration. 2. Fifth Wheel (Upper) a. Kingpin not worn, bent or damaged. Step 4 - Right Rear Trailer Wheel Area b. Anchor frame not cracked, bent, worn or damaged.
  • Page 32 PRE-OPERATION (cont'd) Step 6 - Right of Trailer Area Lights and Reflectors Rear clearance and identification lights, clean and operating and proper colour. Reflectors and conspicuously tape clean and proper colour. Hydraulic Cylinder Free to move on pivot. No oil leaks. Check "B"...

  • Page 33: Hooking Up/Unhooking

    HOOKING UP/UNHOOKING Special care should be taken when hooking up or unhooking trailer to be sure the equipment is in good condition and all systems are functioning as required. 4.6.1 HOOKING UP Follow this procedure when hooking up the trailer to towing vehicle (tractor or lead trailer): 1.
  • Page 34 4.6.1 HOOKING UP (cont'd) 11. Back slowly under trailer keeping the king pin centered in the fifth wheel jaws. 12. Back up until the fifth wheel coupler locks on the trailer king pin. 13. Gently move the towing vehicle back and forth while the trailer brakes are engaged to check that the jaws have locked around the king pin.

  • Page 35: Unhooking

    4.6.2 UNHOOKING 1. Position towing unit and trailer in a straight line on a clear, level and firm surface. 2. Apply the trailer brakes and the parking brakes on the tractor before dismounting. 3. Place blocks or chocks in front of and behind trailer wheels if not on a level surface.

  • Page 36: Loading/Unloading

    LOADING/UNLOADING It is the responsibility of the operator to review and be familiar with the trailer loading capacity specifications and be sure that you comply with any and all load limitations or restrictions applicable in the jurisdictions where you will be travelling.
  • Page 37 LOADING/UNLOADING (cont'd) B. Unloading 1. Clear the area of bystanders and remove debris from unloading area. 2. Determine the unloading side. Latch the pivot side and release lifting side. 3. Open and remove the tarp if so equipped. 4. Proceed to the unloading area. 5.
  • Page 38 LOADING/UNLOADING (cont'd) 6. Engage PTO to start the flow of hydraulic oil. 7. Raise the tub to discharge material. 8. Stay away from the trailer while dumping to prevent being hit by material. Keep others away. 9. When handling material that does not flow evenly or requires dislodging, use extra care.

  • Page 39: Transporting

    TRANSPORTING By following the previous instructions, your Midland trailer unit has been hooked-up and is ready to go. Although all operating instructions are common sense, it is wise to review them periodically to refresh your memory. Good operational procedures result in a safe workplace for the operator and others.

  • Page 40: Braking Guidelines

    4.8.2 BRAKING GUIDELINES Safe, reliable and trouble-free operation of your trailer requires that the brakes be maintained in good operating condition at all times and the driver follows good application techniques when driving. The irresponsible use of brakes by the driver when travelling can contribute to low brake life or result in system malfunctions, short tire life and poor tire wear patterns.

  • Page 41: Tires

    4.8.3 TIRES When operating the trailer, it is the responsibility of the driver to check the tires frequently. Inflation pressures, wear patterns and matching are critical parameters that must be monitored. The following factors affect tire care: 1. Inspection frequency: Tires should always be checked before the start of a run and twice during the day or every 4 operating hours, whichever comes first.

  • Page 42: Service And Maintenance

    SERVICE AND MAINTENANCE SERVICE This section provides information on daily and periodic service and maintenance of the Trailer unit. Follow these recommendations for safe and 5.1.1 FLUIDS AND LUBRICANTS dependable operation of the Trailer unit. Refer to the safety section at the front of the operator's manual 1.

  • Page 43: Servicing Intervals

    5.1.3 SERVICING INTERVALS A standard servicing schedule is provided as a guide for your convenience. In unusual or extreme operating conditions, increase the frequency or perform additional service items to customize this schedule to your application. Daily, 10 hours or 500 Miles 1.
  • Page 44 5.1.3 SERVICING INTERVALS (cont'd) 2. Drain moisture from air tanks (use cables to open drain valves). IMPORTANT During cold weather drain moisture from the air tanks every day to prevent ice build up. During cold weather operation, use only recommended air line anti freeze in the trailer air system.
  • Page 45 5.1.3 SERVICING INTERVALS (cont'd) 3. Check tire air pressure. Add as required. Fig. 18 TIRES (TYPICAL) Weekly, 10 Days or 5000 Miles 1. Grease slack adjusters (1 location each adjuster). 2. Grease camshaft bearings (1 location each camshaft). Hendrickson Ridewell configuration configuration Fig.
  • Page 46 5.1.3 SERVICING INTERVALS (cont'd) 4. Check wheel hub oil levels. Schematic Fig. 21 HUB OIL LEVEL Retorque the following fasteners: a. Brake/wheel end system fasteners. Refer to Section 5.2.7. Manual Bearing Adjustment a. Tighten to 100 ft-lbs. c. Tighten to 50 ft-lbs. b.
  • Page 47 5.1.3 SERVICING INTERVALS (cont'd) b. Landing gear bolts (Crank type only). 1/2 in. 125 ft. lbs. 5/8 in. 250 ft. lbs. Fig. 23 LANDING GEAR MOUNTING BOLTS c. Retorque cast spoke wheel rim nuts if so equipped. Table 1 Recommended Wheel Bolt Torque (Spoke Wheels) Bolt Size Ft-lbs Torque (Dry)
  • Page 48 5.1.3 SERVICING INTERVALS (cont'd) d. Retorque for stud pilot inner and outer wheel nuts if so equipped. Table 2 Recommended Wheel Stud Torque (Disc Wheels) Ft-lbs Torque Outer Stud Size Wheel Type (Dry) 3/4" - 16 Disc 450 - 500 1-1/8"...
  • Page 49 5.1.3 SERVICING INTERVALS (cont'd) Retorque suspension system fasteners (Refer to charts for torque levels in Maintenance Section 5.2.10.1 and 5.2.10.2). Also refer to suspension manufacturer's recommendation in accompanying manual. Mechanical Fig. 27 SUSPENSION SYSTEM U-BOLTS g. Retorque push block mounting bolts (if so equipped) to 600 ft.
  • Page 50 5.1.3 SERVICING INTERVALS (cont'd) 10,000 Miles (15,000 kms) or Monthly 1. Grease landing gear bearings (3 locations) (crank type only). Fig. 29 LANDING GEAR (TYPICAL)
  • Page 51 5.1.3 SERVICING INTERVALS (cont'd) 2. Retorque fasteners. a. Landing gear. Fig. 30 LANDING GEAR b. Torque mechanical system suspension (refer to Section 5.2.10.2). Fig. 31 MECHANICAL SUSPENSION SYSTEM 25,000 Miles (40,000 kms), Quarterly or Every 3 Months 1. Check condition of wheel ends. Release brakes, jack up the axle and spin the wheel.
  • Page 52 5.1.3 SERVICING INTERVALS (cont'd) 2. Inspect frame and structure for bends, distortion or cracks. a. Kingpin. b. Fifth wheel and mounts. c. Longitudinal transverse frames. d. Latch/Pivot structure. Fig. 33 TRAILER (TW3500 &TW2000) e. Hydraulic cylinder anchor structure. Suspension system anchorage. g.
  • Page 53 5.1.3 SERVICING INTERVALS (cont'd) 4. Inspect hydraulic system components for: a. Binding. b. Rubbing/abrasion. c. Looseness/ dangling. d. Leaks - Tighten leaking fittings. Cylinder/Couplers Valves Fig. 35 HYDRAULIC SYSTEM 5. Inspect air system and components for: a. Perform leak- down test. b.
  • Page 54 5.1.3 SERVICING INTERVALS (cont'd) 6. Clean gladhand screens. Fig. 37 SCREENS 7. Check brake lining thickness. Replace as required. Fig. 38 BRAKE LINING...
  • Page 55 5.1.3 SERVICING INTERVALS (cont'd) 100,000 Miles (150,000 kms) or Annually 1. Reline brakes as required. Fig. 39 BRAKE LINING 2. Change oil in hubs. Fig. 40 HUB OIL (TYPICAL)

  • Page 56: Servicing Record Summary (Lubrication)

    5.1.4 SERVICING RECORD SUMMARY (LUBRICATION) LOCATION DESCRIPTION FREQUENCY LUBRICANT Fifth wheel Coat bearing surface Daily or as needed. Chassi grease.* Coat pivot pins and lock Landing gear Gearbox and screws. Periodic basis (weekly). Chassi grease.* Wheels Check oil level. Weekly, 10 Days or 5000 miles (8000 km).

  • Page 57: Periodic Maintenance And Adjustments

    PERIODIC MAINTENANCE AND ADJUSTMENTS Your trailer can only operate at top efficiency when MAINTENANCE SAFETY it is maintained in good operating condition. The maintenance procedures are summarized from the component manufacturers instructions included with 1. Read and understand all the information this manual.
  • Page 58 5.2.1 TORQUE SPECIFICATION SUMMARY (cont'd) Table 4 Recommended Torque Specifications (cont'd) 2. Mechanical Suspension 3. Wheel End Components Torque Range Description Fastener Size (lb-ft) 1. Hub-cap bolts 10-15 13-20 5/16" 2. Hub fill plug 15-20 20-27 3/8" 3. Adjustment nut - manual bearing Tighten to 100, Size depends on axle adjustment (double nut)

  • Page 59: Kingpin And Oscillating Fifth Wheel Plate

    5.2.2 KINGPIN AND OSCILLATING FIFTH WHEEL PLATE The kingpin at the front of the trailer is the structural component used to transmit accelerating and decelerating loads into the trailer frame. It must be in good condition to perform as required. Visually inspect the kingpin as part of the pre-trip inspection, at 5,000 miles (8,000 km) or weekly and annually...

  • Page 60: Fifth Wheel

    5.2.3 FIFTH WHEEL A fifth wheel system is used on the rear of the front B train unit and on the towing tractor to secure the kingpin and carry the weight of the attached trailer. It must be maintained in good condition to perform as intended.

  • Page 61: Axle Alignment

    5.2.4 AXLE ALIGNMENT A standard axle is used as the main transverse structural member to transmit loads between the trailer frame and the surface contacting components. All running gear components are attached to or part of the axle assembly. Although there is very little that can go wrong with the axle itself, loose, bent or damaged attaching components can cause the axle to go out of alignment.
  • Page 62 5.2.4 AXLE ALIGNMENT (cont'd) 6. Attach an S hook to a steel tape and measure the distance between the kingpin and the end of each axle. Dimensions A and B should be equal within ± 1/8 inch (0.125 in) (3.1 mm). 7.

  • Page 63: Wheel Hubs/Bearings

    5.2.5 WHEEL HUBS/BEARINGS All axles use an oil bath design for lubricating wheel bearings. It is a virtual zero maintenance system providing that the oil remains in the hub. Visually check the hub every day for leaks when checking tire pressure during pre-trip, daily, refuelling, or rest stop inspections.
  • Page 64 5.2.5 WHEEL HUBS/BEARINGS (cont'd) C. Wheel Bearings: Wheel bearings carry and transmit the load between the wheels and the axles. In addition to proper lubrication, the bearings must have the recommended pre-load to perform as expected. Bearing pre-load is set and controlled by the torque of the wheel nuts on the end of each spindle.
  • Page 65 5.2.5 WHEEL HUBS/BEARINGS (cont'd) C. Wheel Bearings (cont'd): Bearing Pre-load: a. Place a pan under the hub drain plug. b. Remove the drain plug from the hub and drain the oil. c. Remove the hub end plate and lay to the side.
  • Page 66 5.2.5 WHEEL HUBS/BEARINGS (cont'd) C. Wheel Bearings (cont'd): Check bearing end play by: Attaching a magnetic base dial gauge indicator to the end of the spindle. Push the wheel in while rotating the wheel slightly until the dial gauge reading doesn't change. iii.

  • Page 67: Wheels

    5.2.6 WHEELS 1. Disc Wheels (Stud Pilot Style): a. Mount single or inner dual wheel on hub. Be careful not to damage the threads on any of A variety of steel or aluminum wheels can be used the studs. on the trailer depending on customer preference b.
  • Page 68 5.2.6 WHEELS (cont'd) 2. Hub Piloted Wheels: a. Mount inner wheel on the hub. b. Slide on the hub guide until the wheel is snug against the hub. Be careful not to damage the threads on any of the studs. c.

  • Page 69: Tires

    5.2.7 TIRES Tires are one of the most important components on a trailer and must be maintained in top condition to obtain their desired load carrying capacity and durability. Tire wear rate can be used as an indicator of the condition of the axle alignment or suspension system.
  • Page 70 5.2.7 TIRES (cont'd) 2. Tire Matching and Spacing on Duals Tires on a dual assembly must be matched for size (diameter or rolling radius) and type of construction to obtain the desired and expected performance and life. a. Matching of Size: Tire sizes can vary between manufacturers and as they wear.

  • Page 71: Brakes

    5.2.8 BRAKES All components in the brake system must be maintained in good condition for the system to perform at top efficiency. It is recommended that brakes and associated components be checked, serviced and maintained per the Preventative Maintenance Schedule (PMP) for the trailer. In this section, the basic brake disassembly and assembly procedure will be covered.
  • Page 72 5.2.8 BRAKES (cont'd) Remove the brake dust covers (if so equipped) to access the shoes. Check the thickness of the linings. Reline or replace shoes when the lining thickness is less than 1/8 inch (3 mm). Uneven wear among the brake shoes on a trailer indicate that the braking system has not been set or maintained properly causing...
  • Page 73 5.2.8 BRAKES (cont'd) B. Installing Brakes: 1. Inspect all the components. Replace any that are cracked, bent or worn. A. Removing Brakes: 2. Lubricate the camshaft spline, slack adjuster 1. Position the trailer on a level hard surface. gear and slack adjuster pins with anti-seize 2.

  • Page 74: Slack Adjusters

    5.2.9 SLACK ADJUSTERS 5.2.9.1 HALDEX AUTOMATIC SLACK ADJUSTER The Haldex S-ABA automatic brake adjuster is a clearance sensing brake adjuster that maintains a nominal distance or clearance between lining and drum. When the Adjuster is Installed: With the brake in the released position, the control arm is fixed to the anchor bracket.

  • Page 75: Automatic Slack Adjuster Maintenance

    5.2.9 SLACK ADJUSTERS (cont'd) IMPORTANT Automatic slack adjusters are for brake adjustment and will not compensate for 5.2.9.2 AUTOMATIC SLACK ADJUSTER faulty foundation brakes. MAINTENANCE Routine Visual/Operational Checks In an S-cam type foundation brake, the final link between the pneumatic system and the foundation - Haldex strongly recommends that routine visual/ brake is the slack adjuster.
  • Page 76 5.2.9 SLACK ADJUSTERS (cont'd) Automatic Brake Adjuster Operational Check Functional operation of the brake adjuster can be 5.2.9.2 AUTOMATIC SLACK ADJUSTER performed on the vehicle by using the following MAINTENANCE (cont'd) procedure: - Block wheels to prevent vehicle from AUTOMATIC SLACK ADJUSTERS grolling.
  • Page 77 5.2.9 SLACK ADJUSTERS (cont'd) 5.2.9.2 AUTOMATIC SLACK ADJUSTER WARNING MAINTENANCE (cont'd) BRAKE ADJUSTMENT PROCEDURE To avoid possible injury, proper precautions must be taken to prevent automatic actuation of the brake chambers while adjusting slack NOTE adjusters. Always block the wheels or me- All adjustments should be made with chanically secure the vehicle.
  • Page 78 5.2.9 SLACK ADJUSTERS (cont'd) 5.2.9.2 AUTOMATIC SLACK ADJUSTER MAINTENANCE (cont'd) Free Stroke Measuring the Free Stroke Free stroke is the amount of movement of the adjuster arm required to move the brake shoes against the drum. With brakes released, measure from the face of the chamber to the center of the clevis pin “A” (fig. 13). Use a lever to move the brake adjuster until the brake shoes contact the drum “B”...
  • Page 79 5.2.9 SLACK ADJUSTERS (cont'd) 5.2.9.2 AUTOMATIC SLACK ADJUSTER MAINTENANCE (cont'd) Free Stroke Above the Range Free Stroke Above the Range If the free stroke is above the range and the applied stroke is too long, there is a problem with the foundation If the free stroke is above the range and the applied stroke is too long, there is a problem brake or the adjuster.
  • Page 80 5.2.9 SLACK ADJUSTERS (cont'd) 5.2.9.2 AUTOMATIC SLACK ADJUSTER MAINTENANCE (cont'd) FAILURE ANALYSIS Automatic Slack Adjuster Failure Analysis If the power stroke is at or more than the maximum stroke, measure free stroke to determine if the slack adjuster is operational. FREE STROKE MEASUREMENT Free stroke is the amount of slack arm movement required to move the brake shoes against the drum.

  • Page 81: Trailer Abs

    5.2.10 TRAILER ABS Each trailer is designed with an ABS (Automatic Braking System) to increase the effectiveness of the brakes during stopping. The system consists of valves, sensors, exciter rings and an Electric Control Unit. Review the brochures included in the documentation package to become familiar with the ABS system and installation.

  • Page 82: 5.2.11 Air Chamber/Spring Brake

    5.2.11 AIR CHAMBER/SPRING BRAKE Air chambers mounted on the axle use the air supply/ pressure from the tractor to apply the service brakes for stopping the vehicle. In addition this air chamber may be equipped with a spring brake that applies the brake when the service side of the brake loses air.

  • Page 83: Suspension System

    The suspension system is the group of components that connect the axle to the main trailer frame and absorb the shock loads from the road. Midland trailers can be equipped with either a mechanical or air ride suspension system. Either system...
  • Page 84 5.2.12 SUSPENSION SYSTEM (cont'd) 5.2.12.1 AIR RIDE SUSPENSION (cont'd) Typical repairs include but are not limited to: 1. Air Spring Replacement: 2. Shock Absorber Replacement: Air springs are designed to be virtually trouble- Shock absorbers remove energy from the free throughout their life. Problems seldom occur suspension system as the trailer encounters holes unless they are cut, punctured, abraded, pinched and bumps on the road surface.
  • Page 85 5.2.12 SUSPENSION SYSTEM (cont'd) 5.2.12.1 AIR RIDE SUSPENSION (cont'd) 4. Air Control (Ride Height Control): An air ride suspension system uses the air from the tractor to pressurize the air springs. A single height control valve is used to monitor the height of the frame above the axle and add/exhaust air from the system as required to maintain this dimension.
  • Page 86 5.2.12 SUSPENSION SYSTEM (cont'd) 5.2.12.1 AIR RIDE SUSPENSION (cont'd) 5. Dump Valve: All air control systems are equipped with a dump valve that allows the operator to exhaust the air from the system as required. a. Always dump the air when parking the trailer and before unhooking.

  • Page 87: Mechanical Suspension

    5.2.12 SUSPENSION SYSTEM (cont'd) b. Check fit and function of all bushings. c. Check all hanger and hanger bracing welds 5.2.12.2 MECHANICAL SUSPENSION for cracks. Two types of mechanical suspensions are available d. Check all other welds for signs of cracks or on the trailer and must be specified and ordered from distortion.

  • Page 88: Suspension System Schematics

    5.2.12 SUSPENSION SYSTEM (cont'd) 5.2.12.3 SUSPENSION SYSTEM SCHEMATICS Fig. 67 Midland Lift Axle...

  • Page 89: Air System

    5.2.13 AIR SYSTEM 5.2.13.2 AIR SYSTEM FUNCTIONAL A vehicle air system is a combination of the Trailers are equipped with an air system, that is components on the tractor and the trailer. All must pressurized by a compressor on the tractor, for be maintained in good condition for the entire system operating the "discharge gates", brakes and air to function as required.

  • Page 90: Electrical System

    5.2.14 ELECTRICAL SYSTEM All trailers are equipped with an electrical system for providing power for lights and electrical controls. All components are designed to minimize the effects of foul weather and adverse operating conditions. However, it is the responsibility of the operator to check and verify that all components are in good condition and functioning as intended.

  • Page 91: Trouble Shooting

    If you encounter a problem that is difficult to solve, even after having read through this trouble shooting section and through the specifically related components manufacturer's manuals. please call your local Midland dealer or distributor. Before you call, please have this Operator's Manual and the serial numbers from your trailer ready.
  • Page 92 PROBLEM CAUSE SOLUTION Tires High or uneven tire wear. Over or under inflation. Inflate to proper pressure. Loose wheel stud nuts or Tighten wheel stud nuts or clamps. clamps. Loose or tight wheel bearing. Adjust bearings. Axle bent or out of alignment. Straighten, align or replace axle.
  • Page 93 PROBLEM CAUSE SOLUTION Electrical Bad connection. Lights flicker or do not Check electrical system circuits. come on. Frayed wires. Repair as required. Battery on tractor not sufficiently Charge battery. charged. Damaged or disconnected wire Repair or replace cable. on ground cable. Poor ground at sockets.
  • Page 94 PROBLEM CAUSE SOLUTION Air System Excessive compressor Air leak. Check air line fittings and hose cycling. connections on service or supply line. Check service chamber at clamp housing, push rod for damage. Check service chamber diaphragm. Check emergency chamber clamp and vent holes for leakage.
  • Page 95 PROBLEM CAUSE SOLUTION Air System (cont'd) Trailer brakes drag. System or component failure Assure emergency line maintains 120 psi pressure; check and maintain governor at max. cut-in. Check slack adjuster and chamber/ spring brake push rod alignment for interference. Assure slack adjuster and chamber/spring brake push rod angle 90°...
  • Page 96 PROBLEM CAUSE SOLUTION Air System (cont'd) Park/emer brakes won't System or component failure Check open lines - no kinks, (cont'd). release (cont'd). bends, closed shut-off cocks, restrictions, excessive elbows. Check that brake shoes are not frozen to drums. System or component failure. Park/emer brakes won't hold.
  • Page 97 PROBLEM CAUSE SOLUTION Air System (cont'd) Have authorized service center Poor braking performance Trailer brake lining wear excessive. check for adequate pressure and (cont'd). timing balance relative to tractor/ trailer application. Proceed per problem "trailer brakes drag." Check slack adjuster and chamber/ Trailer brakes slow to apply.
  • Page 98 PROBLEM CAUSE SOLUTION Air System (cont'd) Replace FFV valve. Poor braking performance Full function valve (FFV) leaks at exhaust port with all brakes (cont'd). released. Replace FFV valve. Full function valve (FFV) leaks at exhaust port with service brakes applied. Check for: Spring parking brake (service only service chamber side of...

  • Page 99: Bolt Torque

    BOLT TORQUE BOLT TORQUE CHECKING BOLT TORQUE The tables shown below give correct torque values for various bolts and capscrews. Tighten all bolts to the torques specified in chart unless otherwise noted. Check tightness of bolts periodically, using bolt torque chart as a guide.

  • Page 100: Index

    INDEX PAGE PAGE Bolt Torque ............87 Safety ..............2 General Safety ..........3 Hydraulic Safety .........5 Loading Safety ...........5 Maintenance Safety ........4 Introduction .............1 Operating Safety ........4 Safety Signs/Decals ........6 Sign-Off Form ..........7 Tire Safety ..........6 Travel Safety ..........5 Operation Guidelines ........10 Safety Sign (Decal) Locations ......8 Break-In ............12 Service and Maintenance ......30...
  • Page 101 MIDLAND MANUFACTURING LIMITED BOX 249 ROSENORT, MANITOBA CANADA, R0G 1W0 PHONE (204) 746-2348 TOLL FREE 1-800-827-7023 FAX (204) 746-2286 www.midlandtrailers.com PRINTED IN CANADA ISSUE DATE: JANUARY, 2002 REPRINT: PART NUMBER: 0400000...

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