Tesco ML50-20 Mode d’emploi

MAINTENANCE LIFT

Maintenance



  co 

 

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2-Contents

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Page

ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC

TABLE OF CONTENTS

CHAPTER 2: MAINTENANCE

PERIODIC MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

HYDRAULIC OIL RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CHECKING HYDRAULIC OIL LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FILLING HYDRAULIC OIL RESERVOIR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

LUBRICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Grease Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Oil Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

PROCEDURE FOR BLEEDING AIR FROM HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Bleeding Stabilizer Cylinders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Hi-Lift Cylinder Bleed Valve Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

HYDRAULIC ADJUSTMENTS - HYDRAULIC POWER MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

ELECTRICAL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Troubleshooting Chart - General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

STRUCTURAL REPAIRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Scissor arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Scissor frame, platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Handrails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Surface rust or scratches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

4 Stabilizers and Return Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Figure 1 . . . . 1

ELECTRICAL SCHEMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

How to Read This Schematic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Figure 2 . . . . 1

ELECTRICAL SCHEMATIC - SHEET 1 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - Figure 3 . . . . 1

ELECTRICAL SCHEMATIC - SHEET 2 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - Figure 4 . . . . 1

ELECTRICAL SCHEMATIC - SHEET 3 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - Figure 5 . . . . 1

ELECTRICAL SCHEMATIC - SHEET 4 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - Figure 6 . . . . 1

ELECTRICAL SCHEMATIC - SHEET 5 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - Figure 7 . . . . 1

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TESCO EQUIPMENT LLC ML50-20 MAINTENANCE LIFT

ELECTRICAL SCHEMATIC - SHEET 6 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - -Figure 8 . . . . . 1

ELECTRICAL SCHEMATIC - SHEET 7 OF 7 - - - - - - - - - - - - - - - - - - - - - - - - -Figure 9 . . . . . 1

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ML50-20 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 CYLINDER UPPER ROLLER................................. Page 6

2-1 Figure 4 GREASE POINTS - ROLERS AND PINS ....................................................... Page 7

Section 2: Hydraulic System Adjustments

2-2 Figure 1 LIFT CYLINDER BLEED VALVE..................................................................... Page 3

2-2 Figure 2 HYDRAULIC SYSTEM.................................................................................... Page 5

Section 3: Troubleshooting

Section 4: Repairs

Section 5: System Schematics

2-5 Figure 1 HYDRAULIC SCHEMATIC - ML2 WITH RETURN FILTER............................ Page 2

2-5 Figure 2 HOW TO READ THIS SCHEMATIC ............................................................... Page 5

2-5 Figure 3 ELECTRICAL SCHEMATIC - SHEET 1 OF 7 ................................................. Page 6

2-5 Figure 4 ELECTRICAL SCHEMATIC - SHEET 2 OF 7 ................................................. Page 7

2-5 Figure 5 ELECTRICAL SCHEMATIC - SHEET 3 OF 7 ................................................. Page 8

2-5 Figure 6 ELECTRICAL SCHEMATIC - SHEET 4 OF 7 ................................................. Page 9

2-5 Figure 7 ELECTRICAL SCHEMATIC - SHEET 5 OF 7 ................................................. Page 10

2-5 Figure 8 ELECTRICAL SCHEMATIC - SHEET 6 OF 7 ................................................. Page 11

2-5 Figure 9 ELECTRICAL SCHEMATIC - SHEET 7 OF 7 ................................................. Page 12

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ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC

CHAPTER 2: MAINTENANCE

Section 1: Servicing

1. 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.

If the unit is being operated in severe weather conditions such as extreme heat or cold, or in sandy,

dusty, or snowy areas, increase the frequency of periodic maintenance as necessary.

NOTE: Refer to the chassis manufacturer’s manual for service requirements to the chassis.

PERIODIC MAINTENANCE CHART

PROCEDURE

PERIOD (HOURS)

8250 OTHER

Perform walk-around inspection and check for obvious damage,

missing parts and fluid leaks.

Check spotlights, indicator lights, and beacon lights. X

Check hydraulic oil level. X

Check condition of all handrails and mounting brackets. X

Check condition of operator’s boarding steps. X

Check fire extinguisher levels. Make sure they are secured in

their mounting brackets. (optional)

Inspect pivot pins on platform cylinders for wear. X

Check scissors pivot pins and rollers for wear. X

Inspect condition of all hydraulic hoses and fittings and check for

leakage.

Inspect all hydraulic components for fluid leakage. X

Check operation of the beacon light and platform work lights. X

Inspect all wiring harnesses for damage and security. X

Check operation of the platform mounted control boxes. X

Check condition of bumpers. X

Check condition of Hi-Lift/scissors structure. Check for stress

cracks, physical damage, or corrosion.

May 08

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MAINTENANCE

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TESCO EQUIPMENT LLC ML50-20 MAINTENANCE LIFT

CAUTION

AFTER PERFORMING MAINTENANCE ON THE HI-LIFT, DISPOSE OF ANY

ENVIRONMENTALLY SENSITIVE MATERIALS ACCORDING TO LOCAL ENVIRONMENTAL

REGULATIONS. EXAMPLES OF SUCH MATERIALS INCLUDE: BATTERIES, RUBBER BELTS,

LUBRICANTS (MOTOR OILS AND GREASE), AND HYDRAULIC OIL.

2. HYDRAULIC OIL RECOMMENDATIONS

The hydraulic oil reservoir is factory filled with ISO 15 hydraulic oil at the time of shipping.

SEVERE CLIMATE OPERATION

• If platform lowering becomes too slow in severe cold weather operations, a lower viscosity fluid

may be substituted.

Check platform understructure for cracked welds or corrosion. X

Check condition of placards and safety warning decals. X

Replace return filter 6 mos.

Check that all wiring terminals are secure. Annually

Replace corrosion inhibitor in main electrical control box. Annually

Drain hydraulic reservoir and clean. Annually

Check hoist rollers for wear X No more than

1/4” wear

OIL OPERATING TEMPERATURE RANGE

RECOMMENDED

GRADE OF

HYDRAULIC FLUID

CLIMATE AMBIENT

TEMPERATURE

MAXIMUM BULK OIL

(RESERVOIR

TEMP.)

ISO 32 Hot Above 60° F (15° C) 180° F (82° C)

ISO 15 Moderate 20° F (-7° C) -100° F (38° C) 165° F (74° C)

ISO 5 Cold Below 32° F (0° C) 150° F (60° C)

PERIODIC MAINTENANCE CHART

PROCEDURE

PERIOD (HOURS)

8250 OTHER

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ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC

3. CHECKING HYDRAULIC OIL LEVEL

Maintaining proper hydraulic oil level is important. DO NOT overfill the hydraulic oil reservoir. Hydraulic

oil expands when heated.

1. The hydraulic oil reservoir is equipped with a sight gauge. Ensure that the Hi-Lift is fully lowered

and stabilizers must be in stowed position when checking hydraulic oil level using the sight

gauge. The oil level should be near the “High” mark and must not be below the “Low” mark.

4. FILLING HYDRAULIC OIL RESERVOIR

1. Check hydraulic oil level as described above.

2. Determine the amount of oil to be added: 1.8 gallons of oil will raise the level in the reservoir

about 1 inch.

3. Raise the van body if necessary to access the reservoir filler cap. Support platform with the main-

tenance stand.

4. Clean the area around the filler/breather cap.

5. Remove cap and check strainer screen for any foreign material.

6. Clean thoroughly before putting hydraulic oil into the reservoir.

7. Use only clean, uncontaminated oil, filtered to 10M. Add the quantity of oil determined in step 2.

8. Secure cap when finished.

9. Recheck hydraulic oil level.

Figure 1

HYDRAULIC OIL FILL POINT

HYDRAULIC FILL POINT

(HYDRAULIC OIL ONLY)

May 08

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MAINTENANCE

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TESCO EQUIPMENT LLC ML50-20 MAINTENANCE LIFT

5. LUBRICATION

A. Grease Points

NOTE: Use any commercially available “MP” multipurpose grease which meets NLGI Grade 1 or

2 standards.

Wipe grease fittings clean and apply grease. Before coating tracks with grease, clean surfaces to

remove dirt and foreign material. Refer to Figure 2 thru Figure 4.

B. Oil Points

NOTE: Use SAE 5W-30W oil with brush or oil can as appropriate.

Lift Cylinder Rods - Apply oil to reduce cylinder noise as needed which may be caused by dry

seals.

NOTE: The scissors lift must be raised to access the grease points.

NOTE: Check at intervals listed and lubricate as required. In unusual weather conditions, check at

more frequent intervals.

WARNING

THE SCISSOR LIFT MUST BE SECURED WITH THE MAINTENANCE PROP BEFORE

ACCESSING THE GREASE POINTS.

GREASE POINTS

ITEM COMPONENT TOTAL

FITTINGS INTERVAL

1 Scissor roller pins (Upper/Lower) 4 3 mos.

2 Scissor pivot pins (Upper/Middle/Lower) 8 3 mos.

3 Lift cylinder pins (Upper/Lower) 4 3 mos.

4 Scissor Arm End Pins 4 3 mos.

5 Roller Tracks 3 mos.

GREASE

May 08

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SERVICING 2-1

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ML50-20 MAINTENANCE LIFT TESCO EQUIPMENT LLC

Figure 2

GREASE POINTS DIAGRAM

GREASE ALL TRACKS

Ref. Figure 4

Ref. Figure 3

Ref. Figure 4

May 08

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