Test

1. MAGNETIC SWITCH

CAUTION:
- The following magnetic switch tests should be performed with specified voltage applied.
- Each test should be conducted within 3 to 5 seconds. Power to be furnished should be one- half the rated voltage.




1. Pull-in test
Connect two battery negative leads onto magnetic switch body and terminal C respectively. Then connect battery positive lead onto terminal 50. Pinion should extend when lead connections are made.




2. Holding-in test
Disconnect lead from terminal C with pinion extended. Pinion should be held in the extended position.




3. Return test
Connect two battery negative leads onto terminal 50 and onto switch body respectively. Then connect battery positive lead onto terminal C. Next, disconnect lead from terminal 50. Pinion should return immediately.

2. PERFORMANCE TEST
The starter is required to produce a large torque and high rotating speed, but these starter characteristics vary with the capacity of the battery. It is therefore important to use a battery with the specified capacity whenever testing the starter.
The starter should be checked for the following three items:
- No-load test
Measure the maximum rotating speed and current under a no-load state.
- Load test
Measure the magnitude of current needed to generate the specified torque and rotating speed.
- Stall test
Measure the torque and current when the armature is locked.




1. No-load test
Run single starter under no-load state, and measure its rotating speed, voltage, and current, using the specified battery. Measured values must meet the following standards:

No-load test (Standard):
Voltage/Current
11 V/90 A, or more Rotating speed
TN128000-8311: 3,000 rpm, or more
TN128000-8321: 3,350 rpm, or more




2. Load test (For reference)
Perform this test to check maximum output of starter. Use test bench which is able to apply load (brake) to starter. Measure torque value and rotating speed under the specified voltage and current conditions while controlling braking force applied to starter.

CAUTION: Change engagement position of overrunning clutch and make sure it is not slipping.

Load test (Standard):
TN128000-8311
Voltage/Load
8 V/9.8 N.m (1.0 kg.m, 7.2 ft.lb)
Current/Speed
280 A max./900 rpm mm.
TN128000-8321
Voltage/Load
8 V/13.7 N.m (1.4 kg.m, 10.1 ft.lb)
Current/Speed
370 A, or less/880 rpm, or more




3. Stall test
Using the same test equipment used for load test, apply brake to lock starter armature. Then measure voltage, current, and torque values.
Measured values must meet the following standard.

Stall test (Standard):
TN 128000-8311
Voltage/Current
5 V/800 A, or less
Torque
27.5 N.m (2.8 kg.m, 20.3 ft.lb) mm.
TN128000-8321
Voltage/Current
5 V/1,050 A, or less
Torque
27.5 N.m (2.8 kg.m, 20.3 ft.lb) mm.

NOTE:
Low rotating speed or excessive current during no load test may be attributable to high rotating resistance of starter due to improper assembling. Small current and no torque during stall test may be attributable to excessive contact resistance between brush and commutator; whereas, normal current and insufficient torque may be attributable to shorted commutator or poor insulation. Starter can be considered normal if it passes no-load and stall tests; therefore, load test may be omitted.