Date: 24/6/2019 16:42
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Marui M4A1 Carbine Owner's Manual. MAINTENANCE

Main | Diagram | Component Diagram | Operating | Loading | Warnings | Adjustments | Battery | Maintenance

Top | Troubleshooting Disassembly Assembly Low Bullet Speed Clogged Bullet Fuse Replacement Gear Adjustment Hop Up System Troubleshooting

  • Basic Troubleshooting :
    CAUTION: Never us BB bullets other then those supplied by Tokyo Marui. Use of poor quality BB bullets will cause problems.
    CAUTION: Never disassemble or modify the gun.
  • Symptom Cause Action
    No operation at all Selector lever is set to safety. Set the selector lever to Semi or Full Auto.
    Battery is not charged Charge the battery.
    Battery connector is disconnected. Connect the connector.
    The + and - of battery connector are reverse Connect the connector correctly (check the fuse).
    Fuse is blown out Replace the fuse (see removing clogged bullets )
    Expired motor life or poor electrical connection Replace the motor or check and repair the contacts.
    Although motor is revolving no bullets jump out Bullets are clogged inside the magazine Insert the charging rod into the magazine and move up and down a few times to remove clogged bullets.
    Bullets are clogged in the chamber Remove clogged bullets using the cleaning rod (see removing clogged bullets )
    Faulty gear Purchase the replacement gear from your dealer or us and repair.
    Impossible full-auto operation (automatic firing) Insufficient battery power Charge the battery.
    Faulty bullet feed of magazine Repair clogging of the magazine.
    Poor electrical connection Consult your dealer or us for overhaul maintenance or repair.
    Impossible semi-auto operation (single shot) Deviation in gear timing Set to semi auto after firing 5 to 6 rounds in full auto.
    Symptom Cause Action
    Impossible semi-auto operation (single shot) Insufficient battery power Charge the battery.
    Poor electrical connection Consult your dealer or us for overhaul maintenance or repair.
    Automatic firing cycles become long Insufficient battery power Charge the battery.
    Shooting distance becomes shorter Worn or damaged chamber packing Consult your dealer or us for overhaul maintenance or repair. Replace the chamber packing, piston packing (O-ring) and piston assembly.
    Worn or damaged piston packing (O-ring)
    Deteriorated piston spring
    Faulty BB bullets (too small or heavy) Use the Marui genuine BB bullet.
    Shortage of silicon oil Drop a few drops of silicon oil from under the chamber.
    Gear problem caused by too much blank firing Consult your dealer or us for overhaul maintenance, part replacement (gear, etc.) or repair.
    Too loud operating noise Warn or damaged gear
    Gear problem caused by too much blank firing
    Bullets begin falling out from barrel end Worn or damaged chamber packing
    Faulty BB bullets (too small) Use the Marui genuine BB bullet.
    Being wet or dropped into water (rain) Stop operation immediately, disconnect the battery, wipe off water from inside the main body and the battery, and, after completely dry, carry out the trial firing. If no operation or malfunction is detected, consult your dealer and repair.


  • Normal Disassembly for Overhaul (Take Down):
    Make sure to remove the magazine.
    CAUTION: After removing the magazine, Fire the rifle in semi-automatic once to move the piston forward for easy disassembly.
                        After firing the single shot. Remove the battery for safety reasons.
    CAUTION:
    Attach or detach the upper receiver with the magazine being removed. Otherwise, bullets remaining in the magazine may jump out in to the receiver, causing malfunctions.


    1. The upper receiver can be removed. Remove the frame pin by screw driner and pull open the upper receiver by the carrying handle
    CAUTION: The pin by the hand guard is the pivot point don't over pull.

    WARNING:
    -Don't disassemble beyond what is necessary or the gun may be damaged.



    2. The barrel can be removed. Stop here for barrel cleaning.
  • CAUTION: Do not pull the charging handle or the dummy bolt while disassembling. Doing so will damage the gun.
    CAUTION: Make sure no dirt gets into the M4A1 meca box while the end is open.


  • Assembly:

  • Assembly is the reverse of order of disassembly. Putting silicone oil on the gunsheet will make assembly easier.
    CAUTION: Assemble after confirming the barrel is in place with the upper receiver.
                        Slowly attach or detach the barrel assembly and receive. Attaching or detaching rapidly may cause excessive force and may cause malfunctions.
    WARNING:
    -
    Be careful not to catch your fingers in the moving parts.



    Keep the upper and lower receivers together when inserting lock pin.


  • Maintenance When Bullet Speed Becomes Low:
  • 1. Drop a few drops of silcone oil or Teflon oil from the bullet entrance. Insert BB bullets into the magazine and fire the bullets equivalent to 1 or 2 magazines.

    2. To complete the cleaning, use the cleaning rod (with cotton) as shown below, to remove excess oil.

    WARNING:
    -
    Begin the maintenance after returning the hop-uo dial to the NORMAL (HOP - OFF) position, as in the case of clearing clogged bullets as instructed.
    -Be careful during the maintenance. As the inside of the chamber is precisely designed it can be damaged easily. Use of a hard brush may damage the hop chamber packing.
    -Never use any used BB bullets.
    -Make sure to insert the cleaning rod AFTER returning the hop up lever to the Normal position. (HOP-OFF)


  • Removing Clogged Bullets:
  • 1. Remove the magazine and then the barrel assembly

    2. Return the hop up dial to the Normal position and insert the cleaning rod from the lead edge of the barrel.

    3. Be careful so that the angled part of the cleaning rod faces down and remove clogged bullets.

    WARNING:

    -When bullets are clogged, immediately stop operation. Remove clogged bullets and then restart operation of the air gun. (If operation is continued with bullets being clogged, the mechanism may be damaged.
    -Since clogging bullets may jump out at a high speed always wear safety goggles and confirm safety.



  • Fuse Replacement Procedure:
  • 1. The fuse box is accessible when the fore grip is removed.




    2. Remove the fuse by pushing from the reverse side of the hole, using the cleaning rod.



    The 15A fuse which is common for electric gun series is used

    -- Purchase at a near-by electric shop or gas station.

    WARNING:
    -The fuse may blow out due to an electrical overcurrent. Malfunctions of the internal mechanism are possible. So, check possible faulty parts and then connect the battery again.


  • Fine Adjustment of Gear Engagement:
  • Pull the trigger while adjusting the set screw to the left or right. Stop turning when the motor is the quietest.

    WARNING:
    -Only when the motor noise becomes high after operations for a long period of time, conduct the fine adjustment as shown.



  • Hop Up System Troubleshooting:
    Symptom Cause Action
    Bullets flying upwards Too much hop setting Gradually return adjustment dial towards normal.
    Short Flying distance of bullets (less hopping up effect) Too much hop setting Gradually return adjustment dial towards normal .
    Hop packing contaminated by oil or dirt Fire bullets equivalent to 4 to 5 magazines or clean the chamber using cleaning rod.
    Worn or damaged hop packing Purchase the replacement part at your dealer or from Marui and replace it.
    Symptom Cause Action
    cannot adjust Damaged adjustment dial or other parts. Purchase the replacement part at your dealer or from Marui and repair.
    Frequent bullet clogging
    Too much hop setting Gradually return adjustment dial towards normal.
    Improper or too large sized BB bullets. Use the BB Bullet supplied by Tokyo Marui.
    Dirty hop packing Clean using the cleaning rod or consult your dealer or Marui for repair.

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