EGO ST1500SF Repair Manual Line
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EGO ST1500SF Repair Manual Line

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Table of Contents

REPAIR GUIDELINE
String Trimmer_ST1500SF S& ST1500F
Version: 2
Issue Date: 2016/10/17
Revised Date: 2017/5/15

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Questions and answers

Brian Eugene Barrus
January 27, 2025

Cannot put brush blade on older ST1500SF

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1 comments:
Mr. Anderson
February 10, 2025

The documents do not provide a specific method to attach a brush blade to the EGO ST1500SF. A user mentions difficulty finding a compatible adapter due to the narrow spline. No official parts or instructions are included for converting this model to accept a brush cutting blade.

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Summary of Contents for EGO ST1500SF

  • Page 1 REPAIR GUIDELINE String Trimmer_ST1500SF S& ST1500F Version: 2 Issue Date: 2016/10/17 Revised Date: 2017/5/15...

  • Page 2: Table Of Contents

    Table of Contents Contents Page Troubleshooting Tool list Part 1: How to detect the PCBA and motor 5-24 Part 2: Replace the motor Assembly 25-38 Part 3: Replace the PCBA 39-48 Part 4: Replace the hinge Assembly (Only available for 49-61 ST1500F)

  • Page 3: Troubleshooting

    Troubleshooting Fault Problem Possible Cause Test & Solution Position Replace the cutting line. (e.g. 2.4mm Not feed line Poor cutting line Trimmer line nylon line) Lower Support of the lower housing Not wind line housing Replace the lower housing assembly assembly is worn assembly Blade on the guard assembly is...

  • Page 4: Tool List

    Tool List For Repair NO. Tool List SPEC Remark Phillips Socket wrench 14mm Torx screwdriver T-15 Hex wrench Electric soldering iron Heat gun Heat shrinkable sleeves Scissors To remove the shrinkable sleeve...
  • Page 5 Part 1: How to detect the PCBA and motor...

  • Page 6: Part 1: How To Detect The Pcba And Motor

    How to detect the PCBA and motor 1. Stop the motor and remove the battery pack from the string trimmer. 2. Loosen the two bolts in the guard with the M5 hex wrench, remove the guard from the shaft. Guard Assembly Description Part Number...
  • Page 7 How to detect the PCBA and motor Press the release tabs on the lower housing assembly to remove the lower housing assembly. Description Part Number Qty. Lower Housing 2824808001 Assembly...
  • Page 8 How to detect the PCBA and motor 4. Pull the spring out of the motor shaft .
  • Page 9 How to detect the PCBA and motor 5. Rotate the nut counterclockwise to remove the nut.
  • Page 10 How to detect the PCBA and motor 6. Pull washer out of the motor shaft.
  • Page 11 How to detect the PCBA and motor 7. Pull the upper housing assembly out of the motor shaft and then pull the outer flange out of the motor shaft.
  • Page 12 How to detect the PCBA and motor 8. Loosen the three screws on the shield cover, remove the shield cover from the motor assembly. Shield cover Washer Screw Description Part Number Qty. Shield cover 3127655001 5610059007 Screw washer 5650396003...
  • Page 13 How to detect the PCBA and motor 9. Loosen the screws in the rear housing (7 screws) and handle (7 screws), remove the housings, upper cover and lower cover. Lower cover Upper cover Description Part Number Qty. Description Part Number Qty.
  • Page 14 How to detect the PCBA and motor 10. Loosen the two locking screws on the fixing rings, take out the shaft from the housings. Description Part Number Qty. Fixed Ring 3705178001 Plain Washer 5650005002 Tapping Screw 5610294001...
  • Page 15 How to detect the PCBA and motor 11. Remove the heat-shrinkable sleeves from the connectors with a scissor. 12. Move the transparent sleeve aside, and pull the connectors to separate. heat-shrinkable sleeve transparent sleeve...
  • Page 16 How to detect the PCBA and motor 13. Take the PCBA out of the housing assembly.
  • Page 17 How to detect the PCBA and motor 1) Measure the Fuse in the PCBA. Fuse...
  • Page 18 How to detect the PCBA and motor a) Set the multimeter function to “Resistance measuring” . b) Pierce one pen pin of the multimeter into the sealing glue and force the pin contacting onto one end of the fuse, then pierce another pen pin into the sealing glue and contacting onto the other end of the fuse.
  • Page 19 How to detect the PCBA and motor 2) Measure the MOSFET in the PCBA (Step 1) a) Set the multimeter function to “Diode measuring” . b) Contact the red pen pin to the negative electric contact. c) Contact the black pen pin to the three connectors separately and measure the voltage.
  • Page 20 How to detect the PCBA and motor Figure showing how to measure the MOSFET in the PCBA (Step 1)
  • Page 21 How to detect the PCBA and motor 3) Measure the MOSFET in the PCBA (Step 2) a) Keep the multimeter function setting at “Diode measuring”. b) Pierce black pen pin of the multimeter into the sealing glue and force the pin contacting onto one side of the fuse.
  • Page 22 How to detect the PCBA and motor Figure showing how to measure the MOSFET in the PCBA (Step 2)
  • Page 23 How to detect the PCBA and motor 14. Take out the motor assembly from the motor housing. 15. Remove the heat-shrinkable sleeves from the cables and disconnect the cables. Motor housing Motor assembly Motor assembly...
  • Page 24 How to detect the PCBA and motor 4) Test the motor assembly to judge if it is open-circuit. a) Set the multimeter function to “Resistance measuring” . b) Measure the resistance between any of the two connectors. c) If any of the measurements is infinite, means the circuit between the two connectors is open circuit, the motor is damaged.

  • Page 25: Part 2: Replace The Motor Assembly

    Part 2: Replace the Motor Assembly...
  • Page 26 Replace the Motor Assembly 1. Take the motor assembly out of the motor housing as shown in the “How to detect the PCBA and motor” section. Motor assembly Description Part Number Qty. Motor Assembly 2730220001...
  • Page 27 Replace the Motor Assembly 2. Replace the damaged motor with a new one. 3. The motor housing can be replaced as well if it is broken or worn. 4. Place new heat-shrinkable sleeves through the cables. Connect the cables with electric soldering iron.
  • Page 28 Replace the Motor Assembly 5. Move the heat-shrinkable sleeves to cover the soldering points and use a hot air gun to shrink the sleeves. 6. Position the motor assembly into the motor housing; mount the shield cover on the motor assembly and lock it with three screws and washers.
  • Page 29 Replace the Motor Assembly 7. Put the outer flange onto the shaft and then put the upper housing assembly onto the shaft.
  • Page 30 Replace the Motor Assembly 8. Mount washer onto the motor shaft.
  • Page 31 Replace the Motor Assembly 9. Mount the nut onto the motor shaft and then rotate the nut clockwise with socket wrench.
  • Page 32 Replace the Motor Assembly 10. Mount the spring onto its position.
  • Page 33 Replace the Motor Assembly 11. Align the tabs on the lower housing assembly with the holes on the upper housing assembly to mount the lower housing assembly onto the upper housing assembly.
  • Page 34 Replace the Motor Assembly 12. Rotate the lower housing assembly counterclockwise as necessary to align the mark “LOAD” on the lower housing assembly with the eyelets on the upper housing assembly.
  • Page 35 Replace the Motor Assembly 13. Cut one piece of trimmer line 16ft (5m) long. Insert the line into the eyelet on the upper housing assembly. Push until the end of the line comes out of the other side of the upper housing assembly.
  • Page 36 Replace the Motor Assembly 15. Assemble the connectors in the rear housing. a) Place new heat-shrinkable sleeves through the connectors. b) Plug the three connectors and make sure they are fully insert in place. Correct connection: White to White, Black to Black, Blue to Green. Move the transparent sleeves and the heat-shrinkable sleeves to cover the connectors and use a hot air gun to shrink the sleeves.
  • Page 37 Replace the Motor Assembly 16. Align the cables in the grooves of the rear housing. Notice: the black cable must be aligned as followed in the figure below. Cable alignment...
  • Page 38 Replace the Motor Assembly 17. Position the shaft in the rear housing and handle housing, lock it by the fixed rings with the tapping screws. 18. Close the handle housing, put the support leg and upper cover into position, then close the rear housing, lock the housings with 14 tapping screws.

  • Page 39: Part 3: Replace The Pcba

    Part 3: Replace the PCBA...
  • Page 40 Replace the PCBA 1. Take the PCBA out of the housing assembly as shown in the “How to detect the PCBA and motor” section and replace it with a new one. Description Part Number Qty. PCBA 2830192001...
  • Page 41 Replace the PCBA 2. The battery release button, latch, battery ejection lever, housings can be replaced if they are broken or worn. Description Part Number Qty. Battery release 3127201001 button Battery Latch 3127202001 Battery release Latch ejection lever button Battery ejection 3127206001 lever Rear housing...
  • Page 42 Replace the PCBA 3. Place new heat-shrinkable sleeves through the connectors. 4. Plug the three connectors and make sure they are fully insert in place. Correct connection: White to White, Black to Black, Blue to Green. 5. Move the transparent sleeves and the heat-shrinkable sleeves to cover the connectors and use a hot air gun to shrink the sleeves.
  • Page 43 Replace the PCBA 6. Position the PCBA in the housing, align the cables in the grooves of housing. Notice: the black cable must be aligned as followed in the figure below. Cable alignment Cable alignment...
  • Page 44 Replace the PCBA 7. Position the shaft in the rear housing, lock it by the fixed ring with the tapping screw. 8. Fix the switches into the handle housing, align the cables in the grooves. Switches Cable alignment...
  • Page 45 Replace the PCBA 9. Replace the lock-off trigger or switch trigger if they are broken. Lock-off Trigger Compression spring Switch Trigger Description Part Number Qty. Lock-off Trigger 3127654001 Compression Spring 3660030005 Switch Trigger 3127653001...
  • Page 46 Replace the PCBA 10. Mount the lock-off trigger and switch trigger into the handle housing. 11. Position the shaft in the handle housing, lock it by the fixed ring with the tapping screw. Align the fixing hole in the lock-off trigger with the fixing pole in handle and push the trigger in place Align the fixing hole in the...
  • Page 47 Replace the PCBA 12. Close the handle housing, put the lower cover and upper cover into position, then close the rear housing. (pictures on next page) Notice: the fixing pole in the rear housing and handle housing must align with the fixing hole in the shaft.
  • Page 48 Replace the PCBA 13. Lock the housings with 14 tapping screws.

  • Page 49: Part 4: Replace The Hinge Assembly (Only Available For St1500F)

    Part 4: Replace the Hinge Assembly...
  • Page 50 Replace the Hinge Assembly 1. Loosen the screws in the rear housing (7 screws) and handle (7 screws), remove the housings, upper cover and lower cover. Upper cover Lower cover Description Part Number Qty. Tapping Screw 5610294001...
  • Page 51 Replace the Hinge Assembly 2. Loosen the two locking screws on the fixed rings, take out the shaft from the housings. Description Part Number Qty. Fixed Ring 3705178001 Plain Washer 5650005002 Tapping Screw 5610294001...
  • Page 52 Replace the Hinge Assembly 3. Remove the heat-shrinkable sleeves from the connectors with a scissors. 4. Move the transparent sleeve aside, pull the connectors to separate. heat-shrinkable sleeve transparent sleeve...
  • Page 53 Replace the Hinge Assembly 5. Loose and remove the two locking screws on the hinge, fold the shaft. Locking screws Description Part Number Qty. Locking Screw 5620216004...
  • Page 54 Replace the Hinge Assembly 6. Pull out the cables from the hinge. Pull cables...
  • Page 55 Replace the Hinge Assembly 7. Loose and remove the two locking screws on the side of the hinge. 8. Loose the two fixing screws a little bit. locking screws fixing screws Description Part Number Qty. Locking Screw 5620334004...
  • Page 56 Replace the Hinge Assembly 9. Take off the hinge assembly from the shafts, replace it with a new one. 10. The rear shaft and the front shaft also can be replaced if they are bent or broken. Description Part Number Qty.
  • Page 57 Replace the Hinge Assembly 11. With locking holes of the hinge assembly facing you, pass the cables through the right half of the hinge. Right half of the hinge the locking holes of the hinge 12. Mount the front and rear shaft into the hinge set; align the locking holes in the shaft with the locking hole in the hinge.
  • Page 58 Replace the Hinge Assembly 13. Mount the two locking screws into the aligned locking holes, and tighten the locking screws and fixing screws to make sure the hinge assembly is mounted firmly on the shaft. 14. Pass the cables through the left shaft. fixing screws locking screws 15.
  • Page 59 Replace the Hinge Assembly 16. Assemble the connectors in the rear housing. a) Place new heat-shrinkable sleeves through the connectors. b) Plug the three connectors and make sure they are fully insert in place. Correct connection: White to White, Black to Black, Blue to Green. Move the transparent sleeves and the heat-shrinkable sleeves to cover the connectors and use a hot air gun to shrink the sleeves.
  • Page 60 Replace the Hinge Assembly 17. Align the cables in the grooves of the rear housing. Notice: the black cable must be aligned as followed in the picture below. Cable alignment...
  • Page 61 Replace the Hinge Assembly 18. Position the shaft in the rear housing and handle housing, lock it by the fixed rings with the tapping screws. 19. Close the handle housing, put the lower cover and upper cover into position, then close the rear housing, lock the housings with 14 tapping screws.

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St1500f

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