Mining motor with splined output shaft after rebuild and paint at the TEMISA shop

Technical reference · outside current scope

Joy 600128-716 Motor Reference – 235 HP 950 V

Reference only. This low-voltage motor is outside our current service scope. TEMISA accepts medium- and high-voltage motors only.

Current medium/high-voltage service

In short

The Joy 600128-716 is a 235 HP, 950 V, 1,760 rpm AC cutter motor. 235 HP at 950 V is the cutter rating Komatsu publishes for 14CM15, 14CM09, 12CM15 and 12CM12 continuous miners, two motors per machine. This rating is a technical reference only: TEMISA no longer accepts low-voltage motors, including this model.

Joy 600128-716 nameplate data

Part number	600128-716
Power	235 HP
Voltage	950 V
Speed	1,760 rpm
Frequency	60 Hz

Technician machining a rotor shaft on the lathe at TEMISA — Rotor shaft on the lathe. Bearing fits are restored to ANSI/EASA AR100 tolerances.

Application

Which continuous miners use the Joy 600128-716?

235 HP at 950 V, 60 Hz is the cutter rating Komatsu publishes for the 14CM15, 14CM09, 12CM15 and 12CM12 continuous miners, with two cutter motors per machine. This is a rating match: confirm the part number on your motor's nameplate or your machine's parts book.

Source: Rating: Davis Electric (Fairmont, WV) public Joy motor exchange inventory. Machine ratings: Komatsu product pages.

Historical process reference. These tables are not a current offer for this low-voltage model.

Scope of work

Documented repair process: winding and enclosure

What we upgrade	What we never change
Stator rewound with new form-wound coils	Explosion-proof enclosure
Class H insulation system	Flame-path surfaces and their dimensions
Varnish treatment with dehydration and controlled oven cure	Lead entrances
Bearing fits restored to ANSI/EASA AR100 tolerances	Mounting and shaft dimensions
New bearings, induction-mounted, and new seals	Nameplate rating: HP, voltage and speed stay as built
Rotor dynamically balanced
Temperature sensors (RTDs) tested

Enclosure dimensions are not modified. Before a rebuilt explosion-proof motor goes back underground, the mine's qualified electrical person inspects it, as MSHA regulations require.

In our shop

What happens to your motor at TEMISA

1
Teardown and diagnosis
The failed winding is exposed and documented before anything is quoted.
2
Form-wound coils
New coils are formed and taped in the shop; the core is checked first.
3
Varnish and oven cure
The winding is dehydrated, varnished and cured in a controlled oven.
4
Dynamic balance
The rotor is balanced and the residual unbalance is recorded.
5
Release tests
Static and dynamic tests are recorded before the motor ships.

Photos taken at the TEMISA shop. They show the process, not a specific customer motor.

Release tests

Tests recorded for the historical Joy repair

Test	Standard	Acceptance
Winding resistance, phase to phase	IEEE Std 1415	Unbalance < 3%
Insulation resistance, 1 min	IEEE Std 43	> 100 MΩ
Polarization index and dielectric absorption	IEEE Std 43	PI > 2.0 · DAR > 1.5
Step-voltage DC high-potential	IEEE Std 95	> 100 MΩ, leakage < 1 mA
Surge comparison (turn-to-turn)	IEEE Std 522	EAR L-L < 3% · P-P < 10%
Core loop test with thermography	Shop procedure	Uniform core temperature
Rotor growler test	Shop procedure	No open bars
Dynamic balance of rotor	ISO 21940	Residual unbalance recorded
60-minute run test: current, temperature, vibration	Shop procedure	Vibration < 0.11 in/s

Aerial view of the TEMISA plant in Tlajomulco de Zúñiga, Jalisco, Mexico — TEMISA plant, Tlajomulco de Zúñiga, Jalisco. 5,600 m², cranes up to 60 t.

Other Joy cutter motors

Have a different motor above 1,000 V?

Check its nameplate and request a scope review through our medium- and high-voltage enquiry form.

Medium/high-voltage enquiries