Tesco ML50-30 Maintenance Manual
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Tesco ML50-30 Maintenance Manual

Tesco ML50-30 Maintenance Manual

Maintenance lift
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MAINTENANCE LIFT
Maintenance Manual
Manufactured by
TISl:D
co
TE
EQUIPMENT LLC
Coral Springs, Florida

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Summary of Contents for Tesco ML50-30

  • Page 1 MAINTENANCE LIFT Maintenance Manual Manufactured by TISl:D EQUIPMENT LLC Coral Springs, Florida...

  • Page 2: Table Of Contents

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC TABLE OF CONTENTS CHAPTER 2: MAINTENANCE Page Section 1: Servicing PERIODIC MAINTENANCE ............1 HYDRAULIC OIL RECOMMENDATIONS .
  • Page 3 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC ELECTRICAL SCHEMATIC ............1 How to Read This Schematic .
  • Page 4 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC LIST OF FIGURES CHAPTER 2: MAINTENANCE Section 1: Servicing 2-1 Figure 1 HYDRAULIC OIL FILL POINT................. Page 3 2-1 Figure 2 GREASE POINTS DIAGRAM ................. Page 5 2-1 Figure 3 GREASE POINTS - LIFT CYLINDERS UPPER..........Page 6 2-1 Figure 4 GREASE POINTS - LIFT CYLINDERS BOTTOM...........
  • Page 5 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC 2-5 Figure 6 ELECTRICAL SCHEMATIC, LIFT & STAB. CONTROL - SHEET 4 OF 9 ..Page 9 2-5 Figure 7 ELECTRICAL SCHEMATIC, OPTIONS - SHEET 5 OF 9....... Page 10 2-5 Figure 8 ELECTRICAL SCHEMATIC, OPTIONS - SHEET 6 OF 9....... Page 11 2-5 Figure 9 ELECTRICAL SCHEMATIC, OPTIONS - SHEET 7 OF 9.......

  • Page 6: Section 1: Servicing

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC CHAPTER 2: MAINTENANCE Section 1: Servicing PERIODIC MAINTENANCE Regular maintenance is required to ensure optimum performance and long life for machine components. Maintain the unit by performing periodic maintenance at the intervals listed in the Periodic Maintenance Chart below.

  • Page 7: Hydraulic Oil Recommendations

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC PERIODIC MAINTENANCE CHART PERIOD (HOURS) PROCEDURE OTHER Replace return filter 6 mos. Check that all wiring terminals are secure. 6 mos. Replace corrosion inhibitor in main electrical control box. Annually Drain hydraulic reservoir and clean.

  • Page 8: Filling Hydraulic Oil Reservoir

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC FILLING HYDRAULIC OIL RESERVOIR Check hydraulic oil level as described above. Determine the amount of oil to be added: 2.5 gallons of oil will raise the level in the reservoir about 1 inch. Raise the work platform if necessary to access the reservoir filler cap. Support platform with the maintenance stand.
  • Page 9 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC GREASE GREASE POINTS TOTAL ITEM COMPONENT INTERVAL FITTINGS Scissor pivot pins (Upper/Middle/Lower) 6 mos. Scissor Arm End Pins 6 mos. Scissor roller (Upper/Lower) 6 mos. Traversing roller pins 6 mos. Lift cylinder (Upper/Lower) 6 mos.

  • Page 10: Grease Points Diagram

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC WARNING THE SCISSOR LIFT MUST BE SECURED WITH THE MAINTENANCE PROP BEFORE ACCESSING THE GREASE POINTS. Ref. Figure 7 Ref. Figure 6 Ref. Figure 7 Ref. Figure 6 Ref. Figure 7 Ref. Figure 3 Ref.

  • Page 11: Grease Points - Lift Cylinders Upper

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC GREASE POINT TOP LIFT CYLINDER GREASE POINT BOTTOM LIFT CYLINDER Set the maintenance prop. Refer to Chapter 1-2. Raise or lower the lift to access all grease points of upper lift cylinder rollers (4).

  • Page 12: Grease Points - Lift Cylinders Bottom

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC TOP LIFT CYLINDER GREASE POINT GREASE POINT BOTTOM LIFT CYLINDER Figure 4 GREASE POINTS - LIFT CYLINDERS BOTTOM GREASE POINT - 4 PER LEG Figure 5 GREASE POINTS - STABILIZERS SERVICING Page 7 Mar. 17...

  • Page 13: Grease Points - Traversing Cylinder And Rollers

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC GREASE POINT TRAVERSING CYLINDER ROD ENDS - BOTH ENDS GREASE POINT - BOTH ENDS TRAVERSING ROLLER PINS - 8 PLCS Figure 6 GREASE POINTS - TRAVERSING CYLINDER AND ROLLERS MAINTENANCE Page 8 Mar. 17...

  • Page 14: Grease Points - Scissor Rollers And Pins

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC UPPER SCISSOR ROLLERS - BOTH SIDES SCISSOR PIVOT PINS - BOTH SIDES & UPPER AND LOWER SCISSOR ARM END PINS - 4 PLCS SCISSOR CENTER PINS - BOTH SIDES UPPER AND LOWER SCISSOR LOWER ROLLER PINS - BOTH SIDES NOTE: To grease lower scissor rollers, lift must be down.

  • Page 15: Grease Point - Lower Booster Arm

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC GREASE POINT Figure 8 GREASE POINT - LOWER BOOSTER ARM GREASE W/BRUSH BOOSTER ARM LIP SCISSOR ROLLER TRACKS - BOTH SIDES & UPPER AND LOWER Figure 9 GREASE POINTS - TRACKS AND BOOSTER ARM UPPER LIP...

  • Page 16: Oil Points

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC OIL POINTS TOTAL ITEM COMPONENT INTERVAL PLCS Lift Cylinder Rods 6 mos. Platform entry swing gate hinge points & Lock 1 mos. Platform Ext. Segments Pocket & Locking Bar 1 mos. NOTE: Use SAE 5W-30W oil or other adequate Lubricants with brush or oil can as appropriate.
  • Page 17 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 18: Section 2: Hydraulic System Adjustments

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Section 2: Hydraulic System Adjustments WARNING BEFORE STARTING ANY ADJUSTMENT PROCEDURE THAT REQUIRES THE PLATFORM TO BE IN AN ELEVATED POSITION, MOVE THE MAINTENANCE STAND INTO POSITION AND LOWER THE PLATFORM FULLY AGAINST THE MAINTENANCE PROP.

  • Page 19: Hydraulic Adjustments - Hydraulic Power Module

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC CAUTION WHENEVER AN ADJUSTABLE HYDRAULIC RELIEF VALVE OR PRESSURE REDUCING VALVE IS REPLACED, REDUCE THE PRESSURE SETTING PRIOR TO STARTING THE UNIT. ADJUST THE REPLACED COMPONENT TO SPECIFICATION AS OUTLINED IN THE ADJUSTMENT PROCEDURES.

  • Page 20: Figure 1

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC ITEM FUNCTION SETTING PROCEDURE Stabilizer Fully retract lift and stabilizers. Turn valve fully Pressure clockwise and extend/retract stabilizers till all Reducing Valve stabilizers operate smoothly and consistently with the left rear stabilizer last to extend and last to retract (See Adjustment D).

  • Page 21: Hydraulic Adjustments - Traversing Platform Valve

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC HYDRAULIC ADJUSTMENTS - TRAVERSING PLATFORM VALVE Flow Control Valve Loosen locknut (A). Turn clockwise to to slow down and counter-clockwise to speed up. Tigntened locknut. Figure 2 TRAVERSING PLATFORM VALVE MAINTENANCE Page 4 Mar. 17...

  • Page 22: Counter Balance/Holding Valve-Hold Pressure Adjustment

    TESCO EQUIPMENT LLC COUNTER BALANCE/HOLDING VALVE-HOLD PRESSURE ADJUSTMENT NOTE: The pressure on the counter balance holding valves is preset by TESCO at 1400 PSI. Adjustments are accomplished using an Allen wrench on the pressure adjuster and a standard open end wrench on the locknut.

  • Page 23: Lift Down Flow Control Valve Adjustment

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC LIFT DOWN FLOW CONTROL VALVE ADJUSTMENT (Ref. Figure The flow control valve is used to restrict the amount of hydraulic oil being used to open the upper counter balance valves. To have the upper cylinders work with the lower cylinders so that they can come down together.

  • Page 24: Section 3: Troubleshooting

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Section 3: Troubleshooting GENERAL INFORMATION WARNING ONLY QUALIFIED TECHNICIANS, WHO HAVE BEEN TRAINED IN THE USE AND OPERATION OF THIS EQUIPMENT, SHOULD ATTEMPT ANY TROUBLESHOOTING. THE CHASSIS WHEELS MUST BE CHOCKED TO PREVENT THE HI-LIFT UNIT FROM MOVING IN EITHER DIRECTION.

  • Page 25: Introduction

    UP switches function as the ENABLE switch. ELECTRICAL SYSTEM The Model ML50-30 has a 12-volt DC electrical system that controls all functions of the Hi-lift. The components of the electrical system are located in the lower control station, the upper control station, and the main electrical box.

  • Page 26: Troubleshooting Chart - General

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC When a component is repaired or replaced, always check the hydraulic circuit for the correct indicated pressure, correct actuator speeds, and correct hydraulic fluid level. Troubleshooting Chart - General TROUBLESHOOTING TROUBLE PROBABLE CAUSE Ground level controls will not operate with the Vehicle not in lift mode (Parking brake off) vehicle’s engine running.
  • Page 27 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC TROUBLESHOOTING TROUBLE PROBABLE CAUSE Stabilizers will not extend. Vehicle not in lift mode (Parking brake off) Emergency stop activated Circuit breaker tripped or blown fuse Defective solenoid coil or relay Damaged wiring or bad ground...
  • Page 28 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC TROUBLESHOOTING TROUBLE PROBABLE CAUSE Platform mounted spotlight not operating. Burned fuse Dead or low battery Defective light bulb in spotlight Corrosion build up on light bulb terminals Faulty toggle switch on light assembly Faulty ground at spotlight caused by corrosion...
  • Page 29 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC TROUBLESHOOTING TROUBLE PROBABLE CAUSE There is no hydraulic fluid flow or pressure from Shut off valve closed hydraulic oil pump when the engine is running. Clogged filter Blockage on pump's suction port or collapsed...

  • Page 30: Section 4: Repairs

    Scissor frame or van body Repair cracks or damage by welding or splicing as required except where the structural integrity of the unit is affected. Consult with Tesco for approved methods or guidelines for conducting repairs on damaged area. Handrails Replace sections of damaged handrail with a new piece of metal.
  • Page 31 THIS PAGE INTENTIONALLY LEFT BLANK...

  • Page 32: Section 5: System Schematics

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Section 5: System Schematics HYDRAULIC SCHEMATIC 4 Stabilizers & 12VDC Pump with Return Filter Figure 1 ELECTRICAL SCHEMATIC How to Read This Schematic Figure 2 Electrical Schematic, Engine & Chassis - Sheet 1 of 9...

  • Page 33: Hydraulic Schematic - 4 Stabilizers & 12V Pump With Return Filter

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Figure 1 HYDRAULIC SCHEMATIC - 4 STABILIZERS & 12V PUMP WITH RETURN FILTER MAINTENANCE Page 2 Apr. 17...
  • Page 34 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC TESCO NO PART NUMBER/DESCRIPTION NOTE 326-9110-490 • PUMP, 19 GPM TR5012112NFHXNFXB • HYDRAULIC POWER MODULE HYMS20046 •• CARTRIDGE, Systm Relief Valve HYMS20047 •• CARTRIDGE, Stabilizer Flow Control Valve HYMS20049 •• CARTRIDGE, Handpump Valve HYMA10008 ••...
  • Page 35 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC THIS PAGE INTENTIONALLY LEFT BLANK MAINTENANCE Page 4 Dec. 06...

  • Page 36: How To Read This Schematic

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Figure 2 HOW TO READ THIS SCHEMATIC SYSTEM SCHEMATICS Page 5 June 07...

  • Page 37: Electrical Schematic, Engine & Chassis - Sheet 1 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC 12VDC 100 - BATTERY CC1-A IGNITION 101 - Red/Blk Red/Blk 0.2A Orange Orange HOUR 102 - METER START NEGLIGIBLE A (ENGINE STOPPED) IGNITION SW. 0.2A ADDED BY TESCO 103 - ENGINE STOP CC1-B ENGINE...

  • Page 38: Electrical Schematic, Lighting - Sheet 2 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC +12V - 12V Orange 150 - (BODY DOWN) HEADLIGHT SWITCH 151 - 152 - (IGN. ON) LIGHTS (BODY DOWN) 27.6A 153 - 154 - 155 - 156 - BEACON FLASHER 157 - 158 -...
  • Page 39 ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC +12V - 12V CR13 CR14 B ENGINE STOP 200 - ENGINE STOP [OPT.] [OPT.] (NEUTRAL) (STAB STOWED) (STAB STOWED) 201 - 202 - SW10-A SW10-B UCS8 UCS7 LIFT MODE 203 - (BRAKE SET) LOWER E-STOP...

  • Page 40: Electrical Schematic, Lift & Stab. Control - Sheet 4 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC LIFT +12V MODE -12V SW12 ALL MOTION PC-4 LIFT PC-3 ALARM [OPT.] 250 - D 272 ENABLE 7.2A UCS3 [UPPER] 251 - SOL2 CR17 SW13 LIFT GC-1 GC-2 252 - Black ENABLE - 12V 7.2A...

  • Page 41: Electrical Schematic, Options - Sheet 5 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC LIFT MODE +12V -12V SCISSOR HEIGHT (PLAT. EXTENDED) SOL9 LS16 LS16-2 SW21 Rd/Wh Rd/Yl Rd/Yl PLATFORM PC-3 PC-1 300 - EXTEND LT-1 3.0A SW21-A EXTEND Rd/Bl PLATF EXT EXTEND 301 - LT-10 PLATFORM SOL10...

  • Page 42: Electrical Schematic, Options - Sheet 6 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC OPTIONS OPTION FOR BEACON ON WHEN ENGINE RUNNING (CONTINENTAL) NOTE: For this option, the body interior lights and platform floods must both be on timer switches. The rear flood must be either on a timer or be a reverse light (Continental wires the rear flood as a reverse light).

  • Page 43: Electrical Schematic, Options - Sheet 7 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC OPTIONS OPTION FOR MICO BRAKE -12V THIS WIRE INTERNAL TO MICO CONTROL UNIT PARK BRAKE 120 - MICO [OPT] (CLOSED WHEN MICO BRAKE SET) +12V OPTION FOR LIFT/DRIVE SWITCH -12V SW10 LIFT MODE 203 -...

  • Page 44: Electrical Schematic, Tables Of Veh. Connections - Sheet 8 Of 9

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Figure 10 ELECTRICAL SCHEMATIC, TABLES OF VEH. CONNECTIONS - SHEET 8 OF 9 SYSTEM SCHEMATICS Page 13 Mar. 17...

  • Page 45: Figure 11

    ML50-30 MAINTENANCE LIFT TESCO EQUIPMENT LLC Figure 11 ELECTRICAL SCHEMATIC, TABLES OF VEH. CONNECTIONS DPDT & SPDT RELAY WIRING - SHEET 9 OF 9 MAINTENANCE Page 14 Mar. 17...

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