10.5 UMC ROTARY ASSEMBLY - REPLACEMENT

This AD0233 procedure will show you how to replace the B and C - axis assembly on a UMC-750/SS. 

Before beginning, verify that the machine is level.

• Refer to UMC-750 Leveling

This procedure is used for replacement kits:

• 93-2216 UMC-750 4TH/5TH AXIS SERVICE ASSY
• 93-2329 UMC-750/SS 4TH/5TH AXIS SERVICE KIT
• 93-30-5993 UMC-750 4TH/5TH ROTARY SERVICE ASSY 

A forklift and lifting straps will be required to lift the kits.

Push [ZERO RETURN]. Push [ALL].

Jog the B Axis to get access to the bottom (2) center screws on the rotary shields 3 and 4.

Push [POWER OFF].

Set the main circuit breaker to the OFF position.

Lock the main circuit breaker. Use an approved lock with a safety tag.

Remove the tool probe and mounting arm [5].

Remove the rear panels of the enclosure.

Remove the rotary shields [1] thru [4] in the sequence shown.

Set the main circuit breaker to the ON position.

Push [POWER ON].

Push [ZERO RETURN]. Push [ALL].

Jog the B Axis to 90 degrees.

Push [EMERGENCY STOP].

Set Parameter 498:3, C Axis DISABLED, to 1.

Set Parameter 76, LOW AIR DELAY, to 9999999.

Push [POWER OFF].

Turn the main air valve to the OFF position.

Remove the bottom cover [1] for the C Axis .

Disconnect all of the C-Axis cables and air hoses [2].

Install the bottom cover for the C Axis.

Power on the machine.

Jog the B Axis to 0 degrees.

Jog the X Axis to the end of travel in the negative (-) direction.

Push [EMERGENCY STOP].

Set Parameter 151:3, B Axis Disabled, to 1.

Push [POWER OFF].

Set the main circuit breaker to the OFF position.

Lock the circuit breaker and use a safety tag.

Disconnect all of the B-Axis cables and air hoses .

If the machine has the (2) oil reservoirs [1] mounted on the bridge, temporarily put them onto the top of the trunnion (B Axis).

Remove the filler panel [2] and the front clean-out cover [3].

Remove the (4) trunnion support screws [4].

Remove the (2) shims [5] from under the support.

Cut a cable tie [1] in equal halves. Put the two cut ends into the circular channel on the C-Axis body support.

This lets the remaining air and grease out of the assembly.

Turn the trunnion support [4] to the right.

 Caution: To lift the trunnion support, get the aid of another person. The support weighs 85 lb (39 kg).

Remove these parts:

• trunnion support [4]
• retainer for the support bearings [3]
• support bearings [2]

Do not remove the oil seal.

Attach the lift fixture [5] for the B/C Axis to the C Axis.

Use the rear eye bolt to lift the fixture.

Continue lifting until the lift supports the weight of the B/C-Axis assembly.

Loosen the (2) set screws [1] on the left side of the plate that holds the B/C-Axis assembly.

Make sure the lift supports the B/C Axis [3].

Remove the (3) dowel pins.

Remove the (6) screws [2] from the plate that holds the trunnion (B-Axis).

Remove the B/C-Axis assembly from the machine

Put a 2" x 4" x 48" (51 mm x 103 mm x 122 cm) piece of wood [1] onto a pallet.

Put the B/C-Axis assembly onto the pallet.

Install the tooling bracket (P/N T-0057) [2] for the oil reservoirs onto the B/C-Axis assembly.

Attach the oil reservoirs to the tooling bracket.

Remove these parts:

• (6) plugs [1]
• (6) screws [2]
• the C-Axis body support [3]
• (8) set screws [4]

Install these parts onto the replacement B/C-Axis assembly:

• (8) set screws [3]
• the C-Axis body support [2]
• (6) screws [1]

Tighten the screws, but do not torque them yet.

Install the B/C-Axis assembly [1] into the machine.

Install the (6) screws [2] into the B-Axis mounting plate.

Install the (3) dowel pins.

Tighten the screws, leave snug but do not torque..

If the machine had the (2) oil reservoirs mounted on the bridge, install them.

If the machine had the (2) oil reservoirs attached to the enclosure, they must be mounted to the bridge.

Drill and tap (4) 1/4-20 holes at the location illustrated. Drill the holes 0.5" (13 mm) deep.

• A - 6.98" (17.7 cm)
• B - 1" (25.4 mm)
• C - 6.98" (17.7 cm)
• D - 0.75" (19 mm)
• E - 6.25" (15.9 cm)

Connect all of the B-Axis cables and hoses.

Set the main circuit breaker to the ON position.

Push [POWER ON].

Set Parameter 151:3, B Axis DISABLED, to 0.

Push [ZERO RETURN]. Push [ALL].

Installthe (4) trunnion support screws [1].

Install the (2) shims [2] from under the support. 

NOTE: Replace using the SHIMS provided in the kit. 

Jog the B Axis until you can get to the bottom cover [1] for the C Axis.

Push [POWER OFF].

Set the main circuit breaker to the OFF position.

Lock the main circuit breaker and use a safety tag.

Remove the C-Axis bottom cover [1].

Put the C-Axis cables and hoses into the B/C-Axis conduit.

Connect all of the C-Axis cables and hoses [2].

Do not install the bottom cover for the C Axis. It is installed at the end of the alignment procedure.

Set the main circuit breaker to the ON position.

Push [POWER ON].

Set Parameter 498:3, C Axis DISABLED, to 0.

Push ZERO RETURN. Push ALL.