Service Home How To Procedures 50-Taper - Gearbox - Installation Aid - VMC - AD0136
Last updated: 02/21/2025

50-Taper - Gearbox - Installation Aid - VMC

AD0136

Applies to machines built from: January, 1990 to January, 2016

Introduction

This procedure tells you how to install a 50T gearbox.

This procedure applies to the following service kits:

  • 93-30-11490A: GEARBOX 7.5K VMC, 16DP-C SRVC
  • 93-30-11490B: GEARBOX ASSEMBLY 16DP 7.5K VMC HIGEN
  • 93-30-11495A: GEARBOX 10K VMC, 16DP-C SRVC
  • 93-30-11495B: GEARBOX ASSEMBLY 16DP-C 10K VMC HIGEN
  • 93-3011806B: GEARBOX ASSEMBLY 16DP-C 50T VMC
  • 93-3011806C: GEARBOX ASSEMBLY 16DP-C 50T VMC HIGEN
  • 93-30-9743A: GEARBOX ASSEMBLY 16DP-C VF 7.5K 50T
  • 93-30-9743B: GEARBOX ASSEMBLY 16DP-C 7.5K 50T VF HIGEN
  • 93-309744B: TRANS VF 10K 50T 16DP-C SRVC
  • 93-309744C: GEARBOX ASSEMBLY 16DP-C 10K 50T VF HIGEN
  • 93-309982B: GEARBOX ASSEMBLY 16DP-C VF-5/50 30HP 7.5K
  • 93-30-9982C: GEARBOX ASSEMBLY 16DP-C 30HP 7.5K VF-5/50 HIGEN

Note: The service Gearbox assembly requires updated encoder bracket (P/N 25-3339A). If your machine is built before February 2014, you will need to order this bracket for the correct installation of the encoder. After the first gearbox and new encoder bracket replacement, for a machine built before the 2014, ordering a second new bracket is not necessary.

50-Taper - Gearbox - Installation Aid

1

Push [POWER OFF].  Set the main circuit breaker to the OFF position. Lock the main circuit breaker. Use an approved lock with an approved safety tag.

2

Remove these parts from the old gearbox and put them on the replacement gearbox:

  1. Connector bracket
  2. If the pre-CALM machine has been retrofitted with the HAAS Bearingless TSC union, then replace the new gearshift solenoid (has 2 coils) with the original solenoid (has 3 coils) from the old gearbox.

Note: On CALM machines, the connector bracket [2] is installed behind the spindle. The solenoid pack [3] is in the CALM cabinet. Neither require removal.

  1. Solenoid pack
  2. Mid belt shield
  3. Spindle encoder

To retrofit a new service gearbox with a hubbed magnetic encoder install the support bracket using the washers and 8-32 screws [5]. 

 Note: If the encoder bracket does not fit, the updated encoder bracket included in the service kit will need to be ordered.

Install the encoder spring bracket and encoder onto the motor shaft.

WARNING: The hubbed magnetic encoder must not be axially loaded by the motor shaft.

3

Optical and magnetic spindle encoders:

The encoder bracket [1] that holds an optical spindle encoder does not fit on a replacement gearbox. A fitting [2] is in the way. If the encoder bracket does not fit, use the aluminum pipe [3] from the used gearbox. Install the pipe [3] onto the port [4] on the bottom of the replacement gearbox.

Caution: Oil will drain from the ports [3 and 4] when the plug and fitting are removed. Make sure you drain the oil into a pan that is thoroughly cleaned. You must add the oil back into the gearbox oil reservoir when the pipe [3] is installed onto the port [4]. Any contamination in the oil will damage the replacement gearbox.

4

Remove the 300A cable [1] from the connector bracket [2] and the P41 connector [3] on the IO PCB. Discard this cable.

Install the new 300A cable [4] supplied with the kit to the back of the connector bracket.

Install the small 2-pin connector to the location labeled SPARE.

Install the 4-pin connector to the location labeled SPINDLE FAN.

Install the large 2-pin connector to the location labeled OIL PUMP.

Install the other end of the new 300A cable to the P41 connector [3] on the IO PCB.

5

Install the cable labeled VMC GEARBOX 2 LEVEL [1] to the space on the connector bracket labeled OIL LEVEL SWITCH [2].

Install the cable labeled TRANS OIL FLOW [3] to the space on the connector bracket labeled OIL PRESS. SWITCH [4].

Install the cable on the tank-venting solenoid [5] to the space on the connector bracket labeled SPARE [6].

6

The 50T gearbox may arrive with the sump tank drained of oil for shipping.

Remove the oil fill plug. Operate the spindle at 500 RPM.

With the spindle turning, fill the sump tank to the top of the oil plug. Use Mobil SHC 627 transmission oil or equivalent.

Install the oil fill plug.

50-Taper - Gearbox - Installation Aid - Parameter Setup - VMC

Use the tables that follow to verify the correct parameter values. Some parameters may not apply to the software version you have. If changing from optical to magnetic encoder only change the parameters in the second table.

Parameter Name Value Parameter Name Value
57:02 DISABLE GEAR BOX 0 1305 GEAR SHIFT RETRY TYPE 3
57:26 TRANS OIL LOW PRESS 1 1310 ENABLE GEAR BOX OIL LEVEL SENSOR 1
75 GEAR CHANGE SPEED 30 1311 GEAR BOX OIL FLOW SENSOR TYPE Pressure Switch = 0
Flow Sensor = 1
Level Sensor = 2
129 GEAR CH SETTLE TIME 200 1312 GEAR BOX OIL LEVEL ALARM DELAY (DAYS) 10
130 GEAR STROKE DELAY 750 1316 SP MOTOR TEMP SENSOR TYPE 2
180 SP SLIP GAIN 240 1317 SP MOTOR SENSOR MAX TEMP (DEG F) 500000
181 SP MIN SLIP 40 1318 SP MOTOR SENSOR MIN TEMP (DEG F) 0
188 SP ORIENT GAIN 750 1319 SP MOTOR CAUTION TEMP (DEG F) 210
725 SP HIGH SPEED CURRENT PROFILING 1 1320 SP MOTOR ALARM TEMP (DEG F) 250
1304 GEAR SHIFT RETRY SPEED (RPM) 10 1274 GEAR STROKE TIMEOUT 3300

The parameters in the table that follows change with the encoder type and the maximum spindle RPM. Choose the value that matches the encoder type and the maximum spindle RPM.

Note: Use the same values for shafted and hubbed encoders except where noted.

Parameter Name 7,500 RPM - Magnetic Encoder 7,500 RPM - Optical Encoder 10,000 RPM - Magnetic Encoder 10,000 RPM - Optical Encoder
79 SPINDLE STEPS/REV 4096 4000 2048 2000
131 MAX SPINDLE RPM 7500 7500 10000 10000
142 HIGH/LOW GEAR CHANGE 1965 1965 2950 2950
150 MAX SP RPM LOW GEAR 2325 2325 3100 3100
183 SP MAX FREQ 25000 25000 16667 16667
186 SP DECELERATION 81920 81920 76800 76800
187 SP MOT HI GEAR STPS/REV 4096 4000 4096

(Hubbed Encoder 5120)

 4000
239 SPINDL ENC STEPS/REV

8192

(Hubbed Encoder 4096)

 8000

8192

(Hubbed Encoder 4096)

 4000
1287 SPINDLE MAX BEARING RPM 7500 7500 10000 10000
1288 SPINDLE RPM MAX FREQUENCY 7500 7500 10000 10000