JLG 26MRT Service & Maintenance
  1. Manuals
  2. Brands
  3. JLG Manuals
  4. Boom Lifts
  5. 26MRT
  6. Service & maintenance

JLG 26MRT Service & Maintenance

Hide thumbs
Table of Contents

Advertisement

Quick Links

SERVICE & MAINTENANCE
AUSTRALIAN OFFICE
JLG INDUSTRIES, INC.
P.O. Box 5119
11 Bolwarra Road
Port Macquarie, Australia
Telephone: 065 811111
Fax: 065 810122
Model
26MRT
3120791
December 1, 2000
EUROPEAN OFFICE
JLG INDUSTRIES (EUROPE)
Kilmartin Place,
Tannochside Park
Uddingston, Scotland, G71 5PH
Telephone: 01698 811005
Main Fax: 01698 811055
Parts Fax: 01698 811455
CORPORATE OFFICE
JLG INDUSTRIES, INC.
1 JLG Drive
McConnellsburg, PA.
17233-9533
USA
Telephone: (717) 485-
5161
Fax: (717) 485-6417

Advertisement

Table of Contents
loading

Related Manuals for JLG 26MRT

Summary of Contents for JLG 26MRT

  • Page 1 SERVICE & MAINTENANCE Model 26MRT 3120791 December 1, 2000 AUSTRALIAN OFFICE EUROPEAN OFFICE CORPORATE OFFICE JLG INDUSTRIES, INC. JLG INDUSTRIES (EUROPE) JLG INDUSTRIES, INC. P.O. Box 5119 Kilmartin Place, 1 JLG Drive 11 Bolwarra Road Tannochside Park McConnellsburg, PA. Port Macquarie, Australia...

  • Page 3: Hydraulic System Safety

    • USE ONLY APPROVED, NONFLAMMABLE CLEANING ous pressures. Every effort should be made to SOLVENTS. relieve any system pressure prior to disconnecting or removing any portion of the system. 3120791 – JLG Sizzor –...
  • Page 4 INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONS REVISON LOG Original Issue - June 1993 Revised - May 19, 1999 Revised - December 6, 1999 – JLG Sizzor – 3120791...

  • Page 5: Table Of Contents

    Hydraulic Circuit Checks............3-1 3120791 – JLG Sizzor –...
  • Page 6 Electrical System Troubleshooting ..........3-8 – JLG Sizzor –...

  • Page 7: Section 1. Specifications

    Alternator - 40 Amp Cooling System Capacity Turning Radius 1.0 quarts (0.9 liters) - engine Inside - 8 ft. 1 in. (2.5 m) Crankcase Capacity - 2.5 quarts (2.4 liters) Outside - 15 ft. 4 in. (4.7 m) 3120791 – JLG Sizzor –...

  • Page 8: Torque Requirements

    105.0 in. (2.7 m) any remaining diesel fuel. Machine Width Aside from JLG recommendations, it is not advisable to mix oils of different brands or types, as they may 69.0 in. (1.8 m) not contain the same required additives or be of comparable viscosities.

  • Page 9: Cylinder Specifications

    Lift Up Relief - 2100 psi (145 bar) TO AFFECT STABILITY. Lift Down Relief - 900 psi (62 bar) Table 1-5. Critical Stability Weights Component Tire and Wheel Assembly - Std (each) Daihatsu Gasoline/LP Engine Yanmar Diesel Engine Dana Drive Axle 3120791 – JLG Sizzor –...

  • Page 10: Lubrication Diagram

    TO AVOID PERSONAL INJURY, USE SAFETY PROP FOR ALL hydraulic tank. If oil is not visible, add oil until oil is MAINTENANCE REQUIREING PLATFORM TO BE ELEVATED. visible in both ADD and FULL sight windows on tank. Do not overfill tank. – JLG Sizzor – 3120791...

  • Page 11: Serial Number Locations

    SECTION 1 - SPECIFICATIONS Figure 1-2. Serial Number Locations 3120791 – JLG Sizzor –...
  • Page 12 SECTION 1 - SPECIFICATIONS – JLG Sizzor – 3120791...

  • Page 13: Section 2. Procedures

    (waxed) paper. Do not 2. At any time when air, fuel, or oil lines are discon- unwrap reusable or new bearings until they are nected, clear adjacent areas as well as the openings ready to install. 3120791 – JLG Sizzor –...

  • Page 14: Lubrication Information

    Batteries Clean batteries, using a non-metallic brush and a solution 2. JLG recommends Mobilfluid 424, which has an SAE of baking soda and water. Rinse with clean water. After viscosity of 10W-30 and a viscosity index of 152. cleaning, thoroughly dry batteries and coat terminals with an anti-corrosion compound.

  • Page 15: Cylinders - Theory Of Operation

    Avoid mix- cuit is deactivated (control returned to neutral), the valve ing petroleum and synthetic base oils. JLG spool returns to neutral (center) and oil flow is then Industries recommends changing the hydraulic oil directed through the valve body and returns to reservoir.

  • Page 16: Component Functional Description

    6-8 drops per minute, carefully reconnect hose to extend port, then activate cylinder through one complete cycle and check for leaks. – JLG Sizzor – 3120791...

  • Page 17: Lift Cylinder Removal And Installation

    Shut down and disconnect the power Using a suitable brass drift, drive out the rod end source. Adequately support the cylinder rod, if nec- attach pin from the arm assembly. essary. 3120791 – JLG Sizzor –...

  • Page 18: Barrel Support

    CENTER, WHICH COULD CAUSE DAMAGE TO THE PISTON AND 13. Screw the piston counter-clockwise, by hand, and CYLINDER BARREL SURFACES. remove the piston from the cylinder rod. 14. Remove and discard the piston o-rings, back-up rings, guidelock rings and hydrolock seals. – JLG Sizzor – 3120791...

  • Page 19: Rod Seal Installation

    If steel bushing is worn or damaged, rod or bar- rel (as applicable) must be replaced. c. Lubricate inside of steel bushing with WD-40 prior to bearing installation. d. Using arbor of the correct size, carefully press the bearing into the steel bushing. 3120791 – JLG Sizzor –...

  • Page 20: Poly-Pak Seal Installation

    Figure 2-8. Head Seal Kit Installation 4. Install a washer ring onto the rod, then carefully install the head gland on the rod, ensuring that the wiper and rod seals are not damaged or dislodged. – JLG Sizzor – 3120791...

  • Page 21: Tapered Bushing Installation

    68 - 75 Nm Racine - 1-3/8 hex 1-3/16 - 12 thds 75 - 80 ft lb 102 - 109 Nm Racine - 1-7/8 hex 1-5/8 - 12 thds 100 - 110 ft lb 136 - 149 Nm 3120791 – JLG Sizzor –...

  • Page 22: Steer Cylinder Repair

    3. Attach a suitable pulling device to one end of the cylinder rod. 4. Carefully lift the steer cylinder until the cylinder mounting block clears the mounting slot in the bot- Figure 2-12. Steer Cylinder Assembly 2-10 – JLG Sizzor – 3120791...
  • Page 23 9. Continue pushing the rod assembly into the cylinder heads for scoring or other damage and for ovality barrel until the cylinder rod is approximately cen- and tapering. Replace as necessary. tered in the barrel. 3120791 – JLG Sizzor – 2-11...

  • Page 24: Tilt Alarm Switch Adjustment (If Equipped)

    MUM OF EVERY SIX MONTHS TO ENSURE PROPER OPERATION AND ADJUSTMENT OF SWITCH. 1. Park the machine on a flat, level surface and ensure the machine is level. 2. If the motor is not running, turn the ignition switch to 2-12 – JLG Sizzor – 3120791...

  • Page 25: Limit Switch Adjustment

    It may be necessary to use an assistant to adjust the pressure settings while oper- ating the functions from the platform control station. 3120791 – JLG Sizzor – 2-13...

  • Page 26: Drive Axle Repair

    4. With the axle properly supported, remove the eight locknuts and washers securing the u-bolts to the frame, then carefully remove the four u-bolts. Remove the supports and remove the drive axle from the machine. 2-14 – JLG Sizzor – 3120791...
  • Page 27 Do not drill all the way through the ring; the drill could damage the axle shaft. 3120791 – JLG Sizzor – 2-15...
  • Page 28 SECTION 2 - PROCEDURES Figure 2-16. Drive Axle Assembly 2-16 – JLG Sizzor – 3120791...
  • Page 29 (Dana part nos. SP-5026 and SP3020) through the using a seal installer and handle (Dana part nos. D- holes in the adapter and into the flange plate. 157 and C-4171). Lubricate the lip of the seal. 3120791 – JLG Sizzor – 2-17...

  • Page 30: Carrier Section

    (Dana part no. D-128) to the car- rier housing. While monitoring the dial indicator, spread the housing slightly to facilitate removal of the differential case. 2-18 – JLG Sizzor – 3120791...
  • Page 31 Tighten the screws alternately and evenly. Using a increased to 2.268 inches (57.607 mm), which is just what suitable torque wrench (Dana part no. C-524-A or +3 indicates. Or, if a pinion is etched -3, it would require 3120791 – JLG Sizzor – 2-19...
  • Page 32 Record only the read- 4.5 Nm). To increase preload, remove shims; to ing when the indicator is at the highest point. This reading indicates the amount of shims necessary to decrease preload, add shims. 2-20 – JLG Sizzor – 3120791...
  • Page 33 The illustrations in Figure 8-22 bearing installer and handle (Dana part nos. D-156 show typical patterns only, and explain how patterns shift and S-417) to seat the bearing cone. as gear location is changed. When making pinion position 3120791 – JLG Sizzor – 2-21...

  • Page 34: Ring Gear And Pinion Tooth Contact Pattern

    Low backlash is corrected by moving the ring gear away from the pinion. These corrections are made by switching shims from one side of the differential case to the other. Figure 2-18. Ring Gear and Pinion Tooth Contact Pattern 2-22 – JLG Sizzor – 3120791...

  • Page 35: Brake Repair

    1. With the brake mounted in a suitable holding fixture, remove the two socket head assembly bolts. Drive pattern moves slightly higher and toward the heel. Coast pattern moves higher and toward the heel. 3120791 – JLG Sizzor – 2-23...
  • Page 36 2. Press the bearing into position until it bottoms out 16. Install the cover using socket head assembly bolts. on the oil seal borestep. Torque bolts to 9-11 ft. lb. (12-15 Nm). 2-24 – JLG Sizzor – 3120791...
  • Page 37 SECTION 2 - PROCEDURES Figure 2-20. Brake Assembly 3120791 – JLG Sizzor – 2-25...

  • Page 38: Throttle Checks And Adjustments

    2. Disconnect the wire harness from the ADDCO throt- ure to do so will burn out the actuator. tle and install JLG wire harness #4921850 to the ADDCO and the engine harness as shown in Figure 5. Remove the adjustment harness from the ADDCO...

  • Page 39: Addco Adjustments (Gasoline/Dual Fuel Engine)

    SECTION 2 - PROCEDURES Figure 2-21. ADDCO Adjustments (Gasoline/Dual Fuel Engine) 3120791 – JLG Sizzor – 2-27...

  • Page 40: Addco Adjustments (Diesel Engine)

    SECTION 2 - PROCEDURES Figure 2-22. ADDCO Adjustments (Diesel Engine) 2-28 – JLG Sizzor – 3120791...

  • Page 41: Valve Driver Card Setup Procedure

    12. Energize drive joystick and hold the joystick at voltage should read at least +2 volts dc. The “FULL ON.” Make sure the speed switch is set to reading will probably be slightly higher. high speed. 3120791 – JLG Sizzor – 2-29...
  • Page 42 1.0 volts dc, replace the horsepower card. 8. If the voltage is below -1.0 volts dc, verify the wiring between the engine and the horsepower card is properly terminated. If the wiring is okay, replace the horsepower card. 2-30 – JLG Sizzor – 3120791...

  • Page 43: Preventive Maintenance And Inspection Schedule

    11. Check for proper operation while pump/motor is Inspection Report” form. Forms are supplied with each running. new machine and are also available from JLG Customer 12. Check for proper lubrication. Service. Form must be completed and returned to JLG Industries.
  • Page 44 23. Wheel Bearings (2 Wheel Drive) 24. Sizzor Arms 25. Safety Props 26. Sliding Wear Pads 27. Pivot Pins/Bolts 28. Switches, Ground Control 1,11 29. Control Tags * Inspection and Maintenance code 10 to be performed annually 2-32 – JLG Sizzor – 3120791...

  • Page 45: Section 3. Troubleshooting

    This can be ascertained by overriding the bypass valve (mechanically or electrically) so that oil is available to the function valve, then overriding the function valve mechanically. If the function performs satisfactorily, the problem exists with the control circuit. 3120791 – JLG Sizzor –...
  • Page 46 Refer to Electrical System Troubleshoot is moved to down position. ing - No response to control switch. No electrical signal being sent to lift down Refer to Electrical System Troubleshoot control valve. ing - No response to control switch. – JLG Sizzor – 3120791...
  • Page 47 Holding valve on lift cylinder not function- Repair or replace valve. ing properly. High Drive does not operate below horizontal Damaged wiring on limit switch. Repair or replace wiring. Damaged limit switch. Replace limit switch 3120791 – JLG Sizzor –...
  • Page 48 . No electrical signal being sent to the drive Refer to Electrical System Troubleshoot- valve cartridge. ing - No response to control switch. Machine will not travel in reverse See: Machine will not travel forward. – JLG Sizzor – 3120791...
  • Page 49 Repair or replace cylinder. Machine hard to steer or steering is erratic Hydraulic system oil low. Replenish oil as necessary. Restricted or broken hydraulic line or fit- Clean, repair or replace line or fitting. ting. 3120791 – JLG Sizzor –...
  • Page 50 Repair or replace steer linkage. Machine wanders; steering not firm Crossover relief valve set too low or not Reset, repair or replace valve as neces- functioning properly. sary. Steer linkage loose. Tighten linkage. Spindle bushings badly worn. Replace bushings. – JLG Sizzor – 3120791...
  • Page 51 Replace valve; replace cylinder. System(s) operate erratically Sticking or binding valve cartridge, piston Clean, repair or replace components as rod, etc.. necessary Hydraulic oil not at operating tempera- Allow oil sufficient time to warm up. ture. 3120791 – JLG Sizzor –...
  • Page 52 No voltage present at function control Check wiring from emergency stop switch.. switch to function control switch for proper connection or damage. Repair or replace wiring as necessary. Defective function control switch. Replace function control switch. – JLG Sizzor – 3120791...
  • Page 53 Replace electric motor start relay. No voltage supplied to motor from start Check battery cable from relay to motor relay. for proper connection or damage. Repair or replace wire as necessary. Defective motor/pump assembly. Replace motor/pump assembly. 3120791 – JLG Sizzor –...

  • Page 54: Electrical Schematic - Yanmar (Sheet Of 1 Of 2)

    SECTION 3 - TROUBLESHOOTING Figure 3-1. Electrical Schematic - Yanmar (Sheet of 1 of 2) 3-10 – JLG Sizzor – 3120791...

  • Page 55: Electrical Schematic - Yanmar (Sheet Of 2 Of 2)

    SECTION 3 - TROUBLESHOOTING 1870102 C Figure 3-2. Electrical Schematic - Yanmar (Sheet of 2 of 2) 3120791 – JLG Sizzor – 3-11...

  • Page 56: Electrical Schematic - Daihatsu (Sheet 1 Of 2)

    SECTION 3 - TROUBLESHOOTING Figure 3-3. Electrical Schematic - Daihatsu (Sheet 1 of 2) 3-12 – JLG Sizzor – 3120791...

  • Page 57: Electrical Schematic - Daihatsu (Sheet 2 Of 2)

    SECTION 3 - TROUBLESHOOTING 1870103 C Figure 3-4. Electrical Schematic - Daihatsu (Sheet 2 of 2) 3120791 – JLG Sizzor – 3-13...

  • Page 58: Hydraulic Schematic (Sheet 1 Of 2)

    SECTION 3 - TROUBLESHOOTING Figure 3-5. Hydraulic Schematic (Sheet 1 of 2) 3-14 – JLG Sizzor – 3120791...

  • Page 59: Hydraulic Schematic (Sheet 2 Of 2)

    SECTION 3 - TROUBLESHOOTING 1282590 L Figure 3-6. Hydraulic Schematic (Sheet 2 of 2) 3120791 – JLG Sizzor – 3-15...
  • Page 60 SECTION 3 - TROUBLESHOOTING This page intentionally left blank. 3-16 – JLG Sizzor – 3120791...
  • Page 62 England Fax: (49) 421 693 5035 Fax: (61) 2 65 810122 Phone: (44) 870 200 7700 Fax: (44) 870 200 7711 JLG Latino Americana Ltda. JLG Europe B.V. JLG Industries (Norge AS) JLG Polska Rua Eng. Carlos Stevenson, Jupiterstraat 234 Sofeimyrveien 12 UI.

Table of Contents