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Maxon MLA Maintenance Manual

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M-22-06
REV. A
JUNE 2025
© MAXON Lift Corp. 2025

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Summary of Contents for Maxon MLA

  • Page 1 M-22-06 REV. A JUNE 2025 © MAXON Lift Corp. 2025...
  • Page 3 MAXON agrees to replace any components which are found to be defective during the fi rst 2 years of service, and will reimburse for labor based on MAXON’s Liftgate Warranty Flat Rate Schedule.
  • Page 4 PERIODIC MAINTENANCE ....................9 PERIODIC MAINTENANCE CHECKS .................. 9 PREVENTATIVE MAINTENANCE (PM) CHECKLIST ............11 CHECKING HYDRAULIC FLUID ..................12 MLA LUBRICATION DIAGRAM ................... 15 DECALS ..........................16 DECALS & PLATES ......................18 SYSTEM DIAGRAMS ......................20 PUMP MOTOR & VALVE OPERATION ................20 ELECTRICAL &...
  • Page 5 SUMMARY OF CHANGES: M-22-06 REVISION A PAGE DESCRIPTION OF CHANGE Cover Updated REV and date of release. Increased quantity (8) of WARNING decal (P/N 212428-01) on WARNINGS, CAUTIONS & INSTRUCTIONS DECAL SHEET (P/N 212428-01). Updated DECALS and PLATES to show SAFETY INSTRUCTIONS DECAL (P/N 212502-01).
  • Page 6 Comply with the following WARNINGS and SAFETY INSTRUCTIONS while maintaining Liftgates. See Operation Manual for operating safety requirements. WARNING Installing and maintaining a liftgate can expose you to chemicals, including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To mini- mize exposure, install and maintain liftgate in a well-ventilated area and wear proper Personal protective equipment (PPE).
  • Page 7 Listen for scraping, grat- ing and binding noises and correct the problem before continuing to operate Liftgate. • Use only Maxon Authorized Parts for replacement parts. Provide Liftgate model and serial num- ber information with your parts order. Order replacement parts from: MAXON LIFT CORP.
  • Page 8 LIFTGATE TERMINOLOGY LATCH MAIN FRAME HOUSING COLUMN PLATE LATCH CYLINDER LIFTGATE PARALLEL CONTROL COTTER PIN LIFT ARM COLUMN PARALLEL CYLINDER LIFT ARM PLATFORM LATCH PIN MLA LIFTGATE FIG. 8-1...
  • Page 9 NOTE: Photocopy the PM CHECKLIST on the next page to help keep track of periodic maintenance on the Liftgate. Keep completed form with maintenance records. NOTE: When replacing parts, refer to the Parts Portal on the Maxon website for genuine MAXON replacement parts.
  • Page 10 PERIODIC MAINTENANCE - Continued Annually or 5000 Cycles (whichever occurs fi rst) Visually check the entire Liftgate for excessively worn parts and broken welds, especially check the platform hinge pins for excessive wear and broken welds. Perform all Monthly and Quarterly Maintenance checks.
  • Page 11 Satisfactory Repair required Corrected □ □ □ Inspect entire Liftgate for worn parts or broken welds. Satisfactory Repair required Corrected For more detailed information, refer to the Parts Portal on the Maxon website for genuine MAXON TABLE 11-1 replacement parts.
  • Page 12 PERIODIC MAINTENANCE - Continued CHECKING HYDRAULIC FLUID CAUTION Keep dirt, water and other contaminants from entering the hydraulic system. Before opening the hydraulic fl uid reservoir breather cap and hydraulic lines, clean up contaminants that can get in the openings. Also, protect the openings from accidental contamination.
  • Page 13 CHECKING HYDRAULIC FLUID - Continued 3. Check the hydraulic fl uid level in reservoir as follows. With platform on the ground, level should be as BREATHER CAP shown in FIG. 13-1. 1/2” RESERVOIR POWER UNIT FLUID LEVEL (FIG. 13-1) 4. If needed, add fl uid to the reservoir as follows.
  • Page 14 PERIODIC MAINTENANCE - Continued CHECKING HYDRAULIC FLUID - Continued CAUTION Main housing pump cover must be secured cor- rectly to prevent it from becoming a hazard. 5. Bolt on pump cover (FIG. 14-1). Torque the 3/8”-16 cover bolts from 16 to 24 lb-ft. LOCK WASHER, 3/8”...
  • Page 15 MLA LUBRICATION DIAGRAM NOTE: Lube fi ttings are shown for the lift arms, bottom side of the platform and hy- draulic cylinders. There are four lube fi ttings on the RH lift arm and four on the LH lift arm. Two lube fi ttings are located on the bottom of the platform.
  • Page 16 CAPACITY DECAL (REFER TO TABLE 16-1) DECAL G DECAL A DECAL H DECAL C DECAL H FAMILY OWNED DECAL P/N 283445-01 MLA LIFTGATE (CURB SIDE) FIG. 16-1 MODEL ORDER P/N DECAL “CAPACITY” MLA-66 224751 1600 LBS. (725 KG) MLA-86 220387 2000 LBS.
  • Page 17 DECALS - Continued WARNINGS, CAUTIONS & INSTRUCTIONS DECAL SHEET P/N 212428-01 FIG. 17-1...
  • Page 18 NOTE: Preferred decal layout is shown. Decals on the Liftgate are attached at the factory, except for the 24/7 SUPPORT decal. The 24/7 SUPPORT decal is placed at customer’s or installer’s preference. SAFETY INSTRUCTIONS DECAL P/N 212502-01 MAXON DECAL P/N 299097-01 MLA LIFTGATE FIG. 18-1...
  • Page 19 SUPPORT DECAL P/N 298634-01 DECAL F DECAL E DECAL D DECAL B DECAL H QR PARTS DECAL P/N 212431-01 MLA LIFTGATE (STREET SIDE) SERIAL PLATE FIG. 19-1 (REF) NOTE: MAXON 24/7 LIFTGATE SUPPORT service is only available in the Continental U.S.
  • Page 20 SYSTEM DIAGRAMS PUMP MOTOR & VALVE OPERATION SOLENOID SWITCH LOWERING VALVE MOTOR POWER UNIT FIG. 20-1 POWER UNIT MOTOR & VALVE OPERATION REMOTE VALVE OPERATION MEANS ENERGIZED) LIFTGATE FUNCTION LOWERING SOLENOID MOTOR SWITCH VALVE RAISE LOWER REFER TO VALVES SHOWN ON HYDRAULIC SCHEMATIC TABLE 20-1...
  • Page 21 SYSTEM DIAGRAMS - Continued ELECTRICAL & HYDRAULIC SCHEMATIC CYLINDER CYLINDER 1.5 GPM 1.5 GPM LOWERING VALVE OUTLET PORT (9/16-18 SAE #6) RETURN LINE GREEN FLOW CONTROL VALVE 138 +/- 7 BAR 2000 +/- 100 PSI GROUND (PUMP) TRUCK BATTERY FUSE SOLENOID 150 AMP SWITCH...
  • Page 22 TROUBLESHOOTING TROUBLESHOOTING CHART CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION ENSURE BATTERY IS CHARGED. CHECK BATTERY DEAD BATTERY, LOW VOLTAGE CONNECTIONS. REPLACE OR RECHARGE BATTERY. CHECK BATTERY CORRODED OR LOOSE WIRE CONNECTIONS. CONNECTIONS REPLACE DEFECTIVE PLATFORM WILL NOT RAISE TERMINALS. OR LOWER, MOTOR DOES REPLACE FUSES (10 AMP &...
  • Page 23 TROUBLESHOOTING - Continued CONDITION POSSIBLE CAUSE POSSIBLE SOLUTION PLATFORM WILL NOT OPEN PLATFORM IS LATCHED UNLATCH PLATFORM VERIFY LOAD CAPACITY. LOAD CAPACITY EXCEEDED ADJUST LOAD. STRUCTURAL DAMAGE REPLACE DEFECTIVE PARTS. LOW HYDRAULIC FLUID LEVEL FILL RESERVOIR. ENSURE BATTERY IS CHARGED. CHECK BATTERY CONNECTIONS.
  • Page 24 TROUBLESHOOTING - Continued HOW TO CHECK LOWERING VALVE 1. Unfold and lower platform to the ground (FIG. 24-1). Refer to Operation Manual for detailed operating instructions. PLATFORM OPEN ON THE GROUND FIG. 24-1 2. Unbolt and remove pump cover from main housing as shown in FIG.
  • Page 25 3. Place a multimeter (+) lead on the 3-stud block, and the (-) lead (+) 12.4 VDC to ground stud, as shown in TO LOWERING 3-STUD FIG. 25-1. Next, hold the control VALVE COIL BLOCK switch in the DOWN position. Refer to Operation Manual for FUSE detailed operating instructions.
  • Page 26 TROUBLESHOOTING - Continued HOW TO CHECK LOWERING VALVE - Continued 5. The lowering valve (FIG. 26-1) may be stuck in the “open” position. Remove the coil and lowering valve cartridge (FIG. 26-1). REMOVE LOWERING VALVE CARTRIDGE FIG. 26-1 6. Next, check the valve cartridge as fol- lows.
  • Page 27 HOW TO CHECK STARTER SOLENOID 1. Unfold and lower platform to the ground (FIG. 27-1). Refer to Operation Manual for detailed operating instructions. PLATFORM OPEN ON THE GROUND FIG. 27-1 2. Unbolt and remove pump cover from main housing as shown in FIG. 27-2. LOCK WASHER, 3/8”...
  • Page 28 TROUBLESHOOTING - Continued HOW TO CHECK STARTER SOLENOID - Continued 3. Check for +12.4 volts DC input to solenoid switch by using voltmeter between terminal "A" (FIG. 28-1) and ground. If there is no power to the solenoid switch, ensure 150 AMP fuse is not blown.
  • Page 29 HOW TO TEST PRESSURE RELIEF VALVE 1. Unfold and lower platform to the ground (FIG. 29-1). Refer to Operation Manual for detailed operating instructions. PLATFORM OPEN ON THE GROUND FIG. 29-1 2. Unbolt and remove pump cover from main housing as shown in FIG.
  • Page 30 TROUBLESHOOTING - Continued HOW TO TEST PRESSURE RELIEF VALVE - Continued 3. Disconnect high pressure hose from tee on the pump port (FIG. 30-1). REMOVING HIGH PRESSURE HOSE FIG. 30-1 4. Connect a tee and adapter (not supplied) to the tee on pump port, as shown in FIG.
  • Page 31 HOW TO TEST FLOW CONTROL VALVE 1. Unfold and lower platform to the ground (FIG. 31-1). Refer to Operation Manual for detailed operating instructions. PLATFORM OPEN ON THE GROUND 2. Test the fl ow control valve by com- FIG. 31-1 paring the lowering speed with and without a load.
  • Page 32 MLA ELECTRICAL VALUES & TORQUE SPECIFICATIONS SOLENOID SWITCH Coil resistance: 5.4Ω @70ºF. ±15% Ampere: 2.2A Coil terminal torque: 10-15 lb-in max. Contact terminal torque: 30-35 lb-in max. LOWERING VALVE Coil resistance: 6.6Ω @ 70ºF. ±15% Ampere: 1.8A Coil terminal torque: 15-45 lb-in max.
  • Page 33 BOLT TORQUE VALUES CAUTION The torque values in the following table are provided for torquing grade 8 bolts on Liftgate mechanical parts. To prevent damage, never use the infor- mation in this table for torquing electrical or hydraulic hose connections on the pump assembly.

This manual is also suitable for:

Mla-66Mla-86