Tesco ML50-20 Operation And Maintenance Manual
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Tesco ML50-20 Operation And Maintenance Manual

Tesco ML50-20 Operation And Maintenance Manual

Maintenance lift
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MAINTENANCE LIFT
Operator
Manufactured by
Tl8t:D
co
TE
EQUIPf\.fENT LLC
Coral Springs, Florida

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Summary of Contents for Tesco ML50-20

  • Page 1 MAINTENANCE LIFT Operator Manufactured by Tl8t:D EQUIPf\.fENT LLC Coral Springs, Florida...
  • Page 2 TESCO EQUIPMENT LLC ML50-20 MAINTENANCE LIFT OPERATION AND MAINTENANCE MANUAL WITH ILLUSTRATED PARTS LIST EDITION 3, JANUARY 2011 FOR USE WITH ML50-20 MAINTENANCE LIFT Revision 8 PREPARED FOR Federal Express SERIAL NUMBER: 14-04-11475-F-ML5020 TO 14-04-11488-F-ML5020 and up FedEx Asset No.
  • Page 3 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC RECORD OF REVISIONS REV. ISSUE INSERT REV. ISSUE INSERT DATE DATE DATE DATE 1/11 5/11 8/11 5/13 10/13 11/13 1/14 1/15 Jan. 14...
  • Page 4 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC LIST OF EFFECTIVE PAGES Chapter/Section Page(s) Revison Level/ Date Shown Cover Rev. 7 / Jan. 14 Editon Page Rev. 8 / Jan.15 Record of Revisions Rev. 8 / Jan. 15 List of Effective Pages Rev.
  • Page 5 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Chapter/Section Page(s) Revison Level/ Date Shown Rev. 1 / Jan. 11 Rev. 7 / Jan. 14 Rev. 1 / Jan. 11 Rev. 7 / Jan. 14 23-26 Rev. 1 / Jan. 11 Rev. 8 / Jan. 15 5-Contents Rev.
  • Page 6 It is a compilation of the best information available at the time of writing. Tesco strives to be the best in the industry; however, we realize that there is always room for improvement. If you have any comments or corrections to this manual that you feel should be addressed, please contact us by phone or fax.
  • Page 7 FAVOR OF ANY PERSON OR ENTITY OTHER THAN THE ORIGINAL PURCHASER. Tesco will, at its sole option, repair or replace any component, part or parts, if found on examination by Tesco to be defective and if the necessary return charges are prepaid by the original purchaser. Installation labor will be the original purchaser’s responsibility.
  • Page 8 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC LIST OF WARNINGS AND CAUTIONS USED IN THIS MANUAL WARNING A WARNING MEANS THAT A PROCEDURE THAT FOLLOWS COULD CAUSE DEATH OR INJURY TO YOU OR OTHER PERSONNEL IN THE AREA IF THE PROCEDURE IS NOT FOLLOWED AS WRITTEN.
  • Page 9 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC WARNING THE HI-LIFT UNIT AND COMPONENTS ARE NOT INSULATED AGAINST ELECTRICAL SHOCK. ENSURE PROPER CLEARANCE AROUND THE BODY/PLATFORM AND HI-LIFT STRUCTURE. FAILURE TO HEED WARNINGS MAY RESULT IN SERIOUS INJURY OR DEATH TO OPERATOR AND/OR CREW.
  • Page 10 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC CAUTION MAINTAIN A SPACE OF AT LEAST 12 IN (304 MM) BETWEEN THE AIRCRAFT AND WORK PLATFORM. DO NOT MAKE CONTACT WITH ANY PART OF THE AIRCRAFT. CAUTION THE HI-LIFT MUST BE PROPERLY STOWED BEFORE ATTEMPTING TO DRIVE THE VEHICLE.
  • Page 11 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC WHEN MAKING PRESSURE CHECKS AND/OR ADJUSTMENTS ON THE HYDRAULIC SYSTEM. HYDRAULIC OIL WILL CAUSE EYE INJURIES. IF HYDRAULIC OIL GETS ON THE SKIN, WASH AFFECTED AREA IMMEDIATELY TO AVOID IRRITATION. WARNING DRIVE WHEELS MUST BE CHOCKED TO PREVENT MOVEMENT OF THE UNIT IN EITHER DIRECTION.
  • Page 12 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC WARNING DO NOT ALLOW PERSONNEL UNDER THE HI-LIFT UNLESS THE MAINTENANCE PROPS ARE IN PLACE. FAILURE TO SUPPORT THE PLATFORM MAY ALLOW PLATFORM TO FALL, RESULTING IN DEATH OR INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT.

  • Page 13: Table Of Contents

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC TABLE OF CONTENTS CHAPTER 1: GENERAL INFORMATION AND OPERATING INSTRUCTIONS Page Section 1: Description DESCRIPTION ..............1 MAJOR COMPONENTS .
  • Page 14 ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC CAPACITY ............... 1 PERFORMANCE .
  • Page 15 1-2 Figure 9 EMERGENCY HI-LIFT CYLINDER LOWERING ..........Page 14 Section 3: Specifications 1-3 Figure 1 TYPICAL ML50-20 MAINTENANCE LIFT - SIDE VIEW ......... Page 3 1-3 Figure 2 TYPICAL ML50-20 MAINTENANCE LIFT - REAR VIEW ....... Page 4 Section 4: Shipping...

  • Page 16: Section 1: Description

    The Tesco ML50-20 Maintenance Lift is designed to maintain and inspect aircraft. The ML50-20 is a scissor hi-lift unit mounted on a commercial truck chassis with a minimum gross vehicle weight (GVW) rating of 14,500 lb (6577 kg). The work platform operates from a minimum of 52.5 in (1.33 m) floor height up to a maximum 228 in (5.8 m) floor height.

  • Page 17: Ml50-20 Maintenance Lift

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC STEPS PLATFORM SCISSORS TELESCOPIC CHASSIS LOWER CONTROL STABILIZERS Figure 1 ML50-20 MAINTENANCE LIFT GENERAL INFORMATION AND OPERATING INSTRUCTIONS Page 2 Jan. 14...

  • Page 18: Control Stations

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Control Stations Four (4) control stations operate the Hi-Lift functions. The lower control station is located on the driver side forward chassis frame. It is equipped with three (3) push buttons to operate the hi-lift up and down functions, and a beacon switch. It also contains a mushroom head emergency stop switch.

  • Page 19: Section 2: Operation

    Section 2: Operation GENERAL INFORMATION “Safety First!” is the motto at Tesco; therefore, the first part of the Operation section begins with safety features and procedures. Operation of the Tesco ML50-20 Maintenance Lift should not be conducted until the operator is familiar with all the safety features and procedures associated with the ML50-20 Maintenance Lift.

  • Page 20: Safety Features

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC WARNING THE HI-LIFT UNIT AND COMPONENTS ARE NOT INSULATED AGAINST ELECTRICAL SHOCK. ENSURE PROPER CLEARANCE AROUND THE BODY/PLATFORM AND HI-LIFT STRUCTURE. FAILURE TO HEED WARNINGS MAY RESULT IN SERIOUS INJURY OR DEATH TO OPERATOR AND/OR CREW.

  • Page 21: Safety Procedures

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC • The vehicle cannot be moved or driven while in lift mode. NOTE: When parking brake is on, it will activate the LIFT mode. With the parking brake off the unit will be in DRIVE mode.

  • Page 22: Dash Mounted Indicators

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC UPPER FIXED AND PENDANT CONTROL STATIONS DASH MOUNTED STABILIZER INDICATORS HYDRAULIC LOWER CONTROL CONTROL ENCLOSURE/TANK STATION STATION ELECTRICAL PANEL BOX MANUAL OVERRIDE VALVES Figure 1 CONTROL STATION LOCATION Page 4 Jan. 14...

  • Page 23: Figure 2

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC CONTROLS AND INDICATORS Dash Mounted Indicators WARNING DO NOT DRIVE OR MOVE THE TRUCK IF ANY OF THE INDICATOR WARNING LIGHTS ON THE DASH BOARD ARE LIT. SERIOUS INJURY TO OPERATOR OR DAMAGE TO THE UNIT MAY RESULT.

  • Page 24: Figure 3

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Lower Control Station NOTE: In the event of an emergency, depress the red mushroom head control marked EMERGENCY STOP. This cuts power to all control switches and stop the engine. To reset the EMERGENCY STOP, rotate the red mushroom head control clockwise until it releases.

  • Page 25: Upper Control Station

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Upper Control Station (Ref. Figure NOTE: In the event of an emergency, depress the red mushroom head control marked EMERGENCY STOP. This cuts power to all control switches and stop the engine. To reset the EMERGENCY STOP, rotate the red mushroom head control clockwise until it releases.

  • Page 26: Upper Pendant Control Station

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Upper Pendant Control Station (Ref. Figure NOTE: In the event of an emergency, depress the red mushroom head control marked EMERGENCY STOP. This cuts power to all control switches and stop the engine. To reset the EMERGENCY STOP, rotate the red mushroom head control clockwise until it releases.

  • Page 27: Stabilizer Control Station

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Stabilizer Control Station (Ref. Figure STABILIZER RETRACT – black push button switch. When depressed, returns stabilizers to stowed position. STABILIZER EXTEND – black push button switch. When depressed, the stabilizers are deployed so that the platform can be raised.

  • Page 28: Driving The Vehicle

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Driving the Vehicle Ensure the preliminary checklists have been performed before boarding the driver’s cab and operating the vehicle. Drive vehicle according to the vehicle operator’s manual and applicable laws. Hi-Lift (Body) Control Station Operating Procedures Normal Operation Sequence to Raise Unit Slow vehicle to a creep speed when approaching within 20 ft (6 m) of the aircraft.

  • Page 29: Returning Vehicle To Normal Driving Condition

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Once onboard the platform, secure the platform’s entryway and locate the upper pendant control station (ref. Figure Raise the platform by pushing both Up, Up buttons together. Refer to Figure WARNING THE HI-LIFT UNIT AND COMPONENTS ARE NOT INSULATED AGAINST ELECTRICAL SHOCK.

  • Page 30: Maintenance Prop Operation

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Mount vehicle cab and release parking brake. Check the dash mounted warning lights. They should all be extinguished. (e.g., stabilizer and lift are retracted and brake is released.) NOTE: Attempting to drive the vehicle while in LIFT MODE (parking brake on) will stop the engine.

  • Page 31: Emergency Features - Operating Procedures

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC EMERGENCY FEATURES – OPERATING PROCEDURES HANDPUMP HANDPUMP HANDLE Figure 8 EMERGENCY OVERRIDE PROCEDURE Manual Emergency Handpump Retracting (Stowing) Stabilizers WARNING ENSURE THAT THE HI-LIFT IS FULLY LOWERED BEFORE ATTEMPING TO RETRACT STABILIZERS. Insert handle into Handpump (ref.

  • Page 32: Emergency Hi-Lift Lowering

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Emergency Hi-Lift Lowering CAUTION STAND CLEAR OF DESCENDING HI-LIFT. SERIOUS INJURY TO OPERATOR MAY OCCUR IF STRUCK BY DESCENDING LIFT. Close the valve (B) in the hydraulic box (ref. Figure 8) by loosening locknut and turning fully clockwise.

  • Page 33: Section 3: Specifications

    • Hydraulic System Relief Pressure 1,800 psi (11411 kpa) NOTE: The hi-lift lowering speed noted is pre-set by Tesco. The hi-lift lowering speed can be faster or slower by opening or closing the adjustable flow control valve. MAJOR COMPONENTS Chassis Please refer to the chassis manufacturer’s manual.

  • Page 34: Hi-Lift Single Acting Cylinder

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Hi-Lift Single Acting Cylinder • Cylinder Stages • Cylinder Quantity • Stroke 110 in. (2794 mm) • Fluid Capacity Retracted 3.5 US gal (13.25 l) • Fluid Capacity Extended 4.8 US gal (18 l) Double Acting Stabilizer Cylinders •...

  • Page 35: Figure 1

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC 212 in / 5.38 m 228 in (5.8 m) - MAX. FLOOR HT. STAB. SET 266 in / 6.76 m Figure 1 TYPICAL ML50-20 MAINTENANCE LIFT - SIDE VIEW SPECIFICATIONS Page 3 May 08...

  • Page 36: Typical Ml50-20 Maintenance Lift - Rear View

    93.5 in / 2.37 m 52.5 in / 1.33 m - Stab set min floor height - Stab set 51 in / 1.3 m min floor height - Stab set Figure 2 TYPICAL ML50-20 MAINTENANCE LIFT - REAR VIEW Page 4 May 08...

  • Page 37: Section 4: Shipping

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Section 4: Shipping GENERAL INFORMATION This section contains general information on preparing the hi-lift unit for transportation domestically and overseas. Check regulations of the states and/or countries through which the hi-lift unit will be transported for specific requirements.

  • Page 38: Section 5: Storage

    ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC Section 5: Storage SHORT-TERM STORAGE – ONE MONTH MAXIMUM Perform all periodic maintenance services as prescribed in Chapter 2. Chock drive wheels front and rear to prevent movement in any direction. Disconnect and remove the 12-volt battery and store in cool, dry location.

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