Both housing faces
Photograph square to the face with a ruler or scale visible.
Engineering Guide
Electric Tricycle Gearbox Replacement Measurement Guide
Prepare the dimensions, photos and operating data needed to compare an installed gearbox with the catalogue range.
electric tricycle gearbox replacement
Measure the interfaces that control fit.
A model name or overall photo may identify the family, but it does not confirm the pilot, bolt pattern, shaft, axle or shift interface. Use a dimensioned sketch and multiple square-on photos.
- Overall length, width and height
- Mounting-hole pattern and pilot diameters
- Input shaft or spline dimensions
- Output and half-shaft teeth or spline details
- Rear axle width and mounting side
- Shift cable, linkage and bracket geometry
Photo Plan
Take six useful views
Input interface
Show the shaft, key or spline, flange, pilot and bolt pattern.
Axle interface
Show both half-shaft ends, teeth, bearings and seals.
Mounting orientation
Show the gearbox installed in the vehicle with surrounding clearances.
Shift mechanism
Show cable ends, levers, brackets, travel and selected positions.
Identification
Photograph labels, cast marks, motor nameplate and controller model.
Replacement Process
From sample to approved drawing
Initial comparison
Compare model family, ratio, axle width, voltage and visible interfaces.
Dimension clarification
Request missing pilot, bolt, shaft, spline, center-distance and clearance dimensions.
Drawing confirmation
Review the supplier drawing against the existing assembly and vehicle installation.
Sample validation
Install and test under the actual load, speed, shift and route conditions before volume purchase.