Suggested replacement: 
SME forklift, Golf cart motor speed encoder E68EC050A01, E68EC050A, E68EC080A, E68EC081A
 
Application:  Golf Cart Electric Vehicle, Forklift Pallet Truck - HELI, TCM, TAILIFT Forklift Motor
B00MT298B, 9758740006
 
Specification:
Model: E68EC050A01 (compatible with E68EC080A, can interchange each other directly; E68EC051A01 has a different wiring sequence, can not be replaced directly by E68EC050A01)
 
4-Pin connector (Drawing available):
Pin 1: positive (VCC / B+)
Pin 2: groud (B-)
Pin 3: channel A
Pin 4: channel B
 
Components:
Speed sensor (part number: E68EC050A01)
Locking flange (in pair)
Speed sensor gear
Ringnut
Supply voltage: 5V - 24V DC
PPR (pulses per revolution): 64
Maximum speed: 10000 rpm
Duty circle: 50% ± 25%
Rated phase shift: 90° ± 45° EL
Operating temperature: -30°C ~ +120°C
 
Key features:
Low working temperature
High immunity to electromagnetic noise
Easy substitution in case of damage
 
The SME motor encoder E68EC050A01 is used as external motor speed sensor. It can detect the rotating motion of the toothed wheel fixed to the motor shaft and it generates two electrical signals (square wave and open collector type), usual for kind of encoders. The two output signals, named channel A and channel B, are shifted by 90 electrical degrees. Their frequency is proportional to the rotational speed of the motor shaft. Since the toothed wheel has 64 teeth, each channel generates 64 pulses every complete turn of the shaft.  Used on SME Group Motor B00MT298B