Maxon MXT-25 Maintenance Manual Download Page 28

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1921 Slauson

ve. Santa Fe Springs, CA. 90670 (800) 227-41

16 F

AX (888) 771-7713

SYSTEM DIAGRAMS

PUMP & MOTOR SOLENOID OPERATION (GRAVITY DOWN)

GRAVITY DOWN POWER UNIT

FIG. 28-1

TABLE 28-1

POWER UNIT MOTOR & SOLENOID OPERATION

LIFTGATE

FUNCTION

PORT

SOLENOID OPERATION

( MEANS ENERGIZED)

MOTOR

VALVE

“S1”

LOCK

VALVE

RAISE

LOWER

REFER TO VALVES SHOWN ON

HYDRAULIC SCHEMATIC

DIRECTION OF

CONTROLLED

FLOW

STARTER

SOLENOID

MOTOR

“S1” VALVE

“C1”

JUNCTION

BLOCK

Summary of Contents for MXT-25

Page 1: ...M 20 11 REV A DECEMBER 2020 2020 MAXON Lift Corp...

Page 2: ......

Page 3: ...cessing All claims for warranty will be denied if paperwork has not been received or claim submitted via Maxon website for processing by MAXON s Warranty Department within 30 days of repair date All c...

Page 4: ...3 24 DECALS PLATES 26 SYSTEM DIAGRAMS 28 PUMP MOTOR SOLENOID OPERATION GRAVITY DOWN 28 HYDRAULIC SCHEMATIC GRAVITY DOWN 29 ELECTRICAL SCHEMATIC GRAVITY DOWN 30 PUMP MOTOR SOLENOID OPERATION POWER DOWN...

Page 5: ...OR WILL NOT RUN 42 PLATFORM WILL NOT RAISE BUT MOTOR RUNS 43 PLATFORM RAISES BUT LEAKS DOWN 44 PLATFORM RAISES PARTIALLY AND STOPS 46 LIFTGATE WILL NOT LIFT RATED CAPACITY 47 PLATFORM RAISES SLOWLY 49...

Page 6: ...o electrical schematics 31 Added Off Time Delay Module to power down power unit and Table 35 1 33 39 Added Off Time Delay Module to power down electrical schematics 37 Added Off Time Delay Module to p...

Page 7: ...THIS PAGE INTENTIONALLY LEFT BLANK...

Page 8: ...by Recommended practices for welding on steel parts are contained in the current AWS American Welding Society D1 1 Structural Welding Code Steel Damage to Liftgate and or vehicle and personal injury c...

Page 9: ...ediately seek first aid If acid gets on your skin immediately wash it off with soap and water If an emergency situation arises vehicle or Liftgate while operating the Liftgate release the con trol swi...

Page 10: ...s CA 90670 800 227 4116 FAX 888 771 7713 10 LIFTGATE TERMINOLOGY WEDGE FLIPOVER LIFT ARM PLATFORM PARALLEL ARM PUMP ASSEMBLY COVER IS SHOWN CONTROL SWITCH PLATFORM OPENER EXTENSION PLATE LIFT CYLINDER...

Page 11: ...gs or replace parts as required Check electrical wiring for chafing and make sure wiring connections are tight and free of corrosion Use dielectric grease to protect electrical connections Check that...

Page 12: ...hten loose fittings or replace parts as required Check electrical wiring for chafing and make sure wiring connections are tight and free of corrosion Use dielectric grease to protect electrical connec...

Page 13: ...wn for the RH cylinder lift arm parallel arm and open er There are also lube fittings at the same places on the LH cylinder lift arm and parallel arm Refer to the PERIODIC MAINTENANCE CHECKS and PERIO...

Page 14: ...14 1 3 If needed add fluid to the reservoir as fol lows Remove filler cap FIG 14 2 Fill the reservoir with hydraulic fluid to level shown in FIG 14 2 Reinstall filler cap FIG 14 2 2 Check the hydraul...

Page 15: ...BIL MOBIL DTE 10 EXCEL 32 EXXONMOBIL UNIVIS N 32 DTE 24 CHEVRON CHEVRON AV MV32 CHEVRON HIPERSYN 32 U S PRESTIGE PRESTIGE AW HVI 32 KENDALL GOLDEN MV SHELL TELLUS S2 VX 32 ISO 15 OR MIL H 5606 HYDRAUL...

Page 16: ...rees F Grade ISO 32 Below 70 Degrees F Grade ISO 15 or MIL H 5606 NOTE Use correct grade of hydraulic fluid for your location See TABLES 15 1 15 2 for recommended brands 1 Unbolt and remove pump cover...

Page 17: ...prevent it from becoming a hazard To secure pump cover the holder flats must butt against pump cover as shown in the il lustration 7 Bolt on the pump cover as shown in FIG 17 1 Torque the 5 16 18 cov...

Page 18: ...3 Raise platform to a convenient work height to gain access FIG 18 1 There should not be tension on the torsion spring in this position 4 Drive out the roll pin from pin collar on the platform hinge...

Page 19: ...H TORSION SPRING SHOWN POSITIONED IN HOLE 1 FIG 19 1A BRACKET LONG LEG SPRING PIN SPRING BRACKET LOCATION TYPE OF PLATFORM HOLE TO BE USED RH SIDE STEEL PLATFORM FLIPOVER 1 RH SIDE STEEL PLATFORM ALUM...

Page 20: ...inboard to correct position through the platform hinge bracket FIG 20 1 Line up the hole in the platform hinge pin with the hole in the pin collar Install the roll pin through the pin collar until rol...

Page 21: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 21 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 22: ...se platform to bed level FIG 22 1 Measure how much the outboard edge of platform rises above floor level FIG 22 1 The outboard edge must be 1 2 to 2 above floor level FIG 22 1 If indication is correct...

Page 23: ...EXTENSION PLATE REF 2 If the tip of the platform is less than 1 2 above floor level FIG 23 1 turn both RH and LH platform adjust ment bolts clockwise until the platform tip is 1 2 to 2 above floor le...

Page 24: ...isible when approaching vehicle to operate Liftgate Use good common sense when locating these decals on vehicle NOTE Ensure there is no residue dirt or corrosion where decals are attached If necessary...

Page 25: ...Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 25 DECAL SHEET P N 282522 01 FIG 25 1 CAPACITY DECALS TABLE 25 1 MODEL DECAL P N CAPACITY MXT 25 220382 2500 POUNDS 1134 KG MXT 33 220388 02 33...

Page 26: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 26 DECALS PLATES FIG 26 1 MAXON NAME PLATE P N 280004 01 SERIAL PLATE REF FIG 26 1A QR CODE DECAL 299348 09...

Page 27: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 27 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 28: ...ION GRAVITY DOWN GRAVITY DOWN POWER UNIT FIG 28 1 TABLE 28 1 POWER UNIT MOTOR SOLENOID OPERATION LIFTGATE FUNCTION PORT SOLENOID OPERATION MEANS ENERGIZED MOTOR VALVE S1 LOCK VALVE RAISE C1 LOWER REFE...

Page 29: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 29 HYDRAULIC SCHEMATIC GRAVITY DOWN FIG 29 1...

Page 30: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 30 ELECTRICAL SCHEMATIC GRAVITY DOWN SYSTEM DIAGRAMS Continued FIG 30 1...

Page 31: ...1 1 DIRECTION OF CONTROLLED FLOW MOTOR S1 VALVE C2 C1 STARTER SOLENOID POWER DOWN MODULE OFF TIME DELAY MODULE POWER UNIT MOTOR SOLENOID OPERATION LIFTGATE FUNCTION PORT SOLENOID OPERATION MEANS ENERG...

Page 32: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 32 HYDRAULIC SCHEMATIC POWER DOWN SYSTEM DIAGRAMS Continued FIG 32 1 VALVE S1...

Page 33: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 33 ELECTRICAL SCHEMATIC POWER DOWN FIG 33 1...

Page 34: ...U MODULE GRAVITY DOWN GRAVITY DOWN POWER UNIT WITH MAX ECU MODULE FIG 34 1 DIRECTION OF CONTROLLED FLOW MOTOR S1 VALVE MAX ECU MODULE TABLE 34 1 POWER UNIT MOTOR SOLENOID OPERATION LIFTGATE FUNCTION P...

Page 35: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 35 HYDRAULIC SCHEMATIC WITH MAX ECU MODULE GRAVITY DOWN FIG 35 1...

Page 36: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 36 ELECTRICAL SCHEMATIC WITH MAX ECU MODULE GRAVITY DOWN SYSTEM DIAGRAMS Continued FIG 36 1...

Page 37: ...DOWN POWER UNIT FIG 37 1 DIRECTION OF CONTROLLED FLOW MOTOR S1 VALVE C2 C1 STARTER SOLENOID MAX ECU MODULE OFF TIME DELAY MODULE POWER UNIT MOTOR SOLENOID OPERATION LIFTGATE FUNCTION PORT SOLENOID OP...

Page 38: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 38 HYDRAULIC SCHEMATIC WITH MAX ECU MODULE POWER DOWN SYSTEM DIAGRAMS Continued FIG 38 1 VALVE S1...

Page 39: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 39 ELECTRICAL SCHEMATIC WITH MAX ECU MODULE POWER DOWN FIG 39 1...

Page 40: ...l torque 30 35 lb in max Solenoid Valve S1 Coil resistance 6 2 70 F 15 35 8 70 F 15 Ampere 1 6A 0 67A Coil terminal torque 15 45 lb in max Valve cartridge torque 25 30 lb ft max Coil nut torque 15 45...

Page 41: ...11921 Slauson Ave Santa Fe Springs CA 90670 800 227 4116 FAX 888 771 7713 41 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 42: ...rge the batteries if voltmeter indicates less than 12 6 volts DC or 25 2 volts DC for a 24 volt system TERMINAL B BATTERY TERMINAL A LOAD TERMINAL C GROUND GROUND WIRE CONNECTION TERMINAL D COIL DRIVE...

Page 43: ...ering the hydraulic system Before open ing the hydraulic fluid reservoir filler cap drain plug and hydraulic lines clean up contami nants that can get in the openings Also pro tect the openings from a...

Page 44: ...rminal on the S1 lowering solenoid valve FIGS 44 1 and 44 2 If voltmeter reads battery voltage check for faulty wiring or control switch VALVE S1 LOWERING SOLENOID VALVE SOLENOID SWITCH GROUND WIRE CO...

Page 45: ...platform is on the ground Remove S1 lowering solenoid valve FIGS 45 1 and 45 2 Push on the plunger in the valve by inserting small screwdriver in the open end FIG 45 3 If the plunger does not move wi...

Page 46: ...eals are worn Replace seals 6 Check pump oil filter in the reservoir FIGS 46 1 and 46 2 Clean or re place filter if necessary 4 Check for dirty 2750 psi relief valve FIGS 46 1 and 46 2 Clean or replac...

Page 47: ...ify the battery voltage under load from pump motor is a minimum 10 5 volts DC or 21 volts DC for a 24 volt DC system 2 Check for structural damage or lack of lubrication Replace worn parts Keep dirt w...

Page 48: ...with a minimum of 12 6 volts DC available or 25 2 volts DC for 24 volt system the pump is worn and needs to be replaced 4 With platform on the ground remove cover for access to relief valve FIGS 48 1...

Page 49: ...connection on pump FIG 49 1 Verify that there is a minimum of 12 6 volts DC or 24 8 volts DC for 24 volt system at B Recharge the battery if voltmeter indicates less than 12 6 volts DC or 25 2 volts...

Page 50: ...OWLY Continued 3 Remove flow control valve FIGS 50 1 50 1A 50 2 and 50 2A Ensure the flow control valve operates with a smooth spring loaded action Check for debris inside the valve Clean or replace t...

Page 51: ...OWER UNIT FIG 51 1 RELIEF VALVE ADJUSTMENT COVER FIG 51 1A CHECKING 2750 PSI RELIEF VALVE POWER DOWN POWER UNIT FIG 51 2 RELIEF VALVE ADJUSTMENT COVER FIG 51 2A 8 With platform on the ground remove co...

Page 52: ...h lower reading than 12 6 volts DC or 25 2 volts DC for 24 volt system or a reading of 0 volts check for faulty control switch and wiring Check battery cable and ground wire connections in pump assemb...

Page 53: ...platform is on the ground Remove S1 lowering solenoid valve FIGS 53 1 and 53 2 Push on the plunger in the valve by inserting small screwdriver in the open end FIG 53 3 If the plunger does not move wit...

Page 54: ...gh to get a reading Voltmeter should read at least 10 5 volts DC or 22 volts DC for 24 volt system If voltage reading is lower or 0 go to step 4 MEASURING VOLTAGE AT LOCK VALVE WIRING HARNESS CONNECTO...

Page 55: ...D VALVE FIG 55 1 COIL NUT VALVE CARTRIDGE VALVE CARTRIDGE 1 8 CHECKING SOLENOID VALVE FIG 55 2 Keep dirt water and other contaminants from entering the hydraulic system Before opening the hydraulic fl...

Page 56: ...ss If any readings are more than 0 5 ohm check lock valve wiring harness for crimps or damage Repair wiring harness if possible or replace the entire lock valve assembly if nec essary DISCONNECTING LO...

Page 57: ...NECTING LOCK VALVE WIRING HARNESS FIG 57 1 WIRING HARNESS COIL CONNECTOR BOLTING ON PUMP COVER FIG 57 2 8 Bolt on the pump cover as shown in FIG 57 2 Torque the 5 16 18 cover bolts from 10 to 14 lb in...

Page 58: ...f the Liftgate is not damaged the 1800 psi lowering pressure relief valve in the pump may need to be adjusted as follows PLATFORM LOWERED WITH SHACKLES TOUCHING THE GROUND FIG 58 1 SHACKLE 2 Unbolt an...

Page 59: ...T COVER FIG 59 2A 3 With platform on the ground remove cover for access to relief valve FIGS 59 1 59 1A 59 2 and 59 2A Hold the control switch in the RAISE position Adjust the relief valve until the g...

Page 60: ...To secure pump cover the long side of the holder flats must butt against pump cover as shown in the illustration 4 Bolt on the pump cover as shown in FIG 60 1 Torque the 5 16 18 cover bolts from 10 to...

Page 61: ......

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