Maintenance And Inspection - Jet GH-1640 ZX Operating Instructions Manual

7.4 Three jaw universal chuck
With this universal chuck, cylindrical, triangular and
hexagonal stock may be clamped (Fig 20).
To hold big diameter stock, reverse the top jaws.
Use Molykote Paste G (or adequate grease) to lubricate the
jaws.
7.5 Four jaw independent chuck
This chuck has four independently adjustable chuck jaws.
These permit the holding of square and asymmetrical pieces
and enable the accurate concentric set-up of cylindrical
pieces.
7.6 Live centre
The live centre is mounted in ball bearings.
Its use is highly recommended for speeds above 500 RPM.
To eject the live centre, fully retract the tailstock quill.
7.7 Steady and follow rest
The steady rest
serves as a support for longer shafts and ensures a safe
and chatter free operation. The steady rest is mounted on
the bed way with a locking plate.
Tighten the fingers so that they are snug but not tight
against work piece.
Lubricate the fingers to prevent premature wear.
The follow rest
is mounted on the saddle and follows the movement of the
tool. It prevents flexing of long and thin work pieces under
pressure from the tool.
Fig 20
Set the fingers snug but not overly tight. Lubricate the
fingers to prevent premature wear.
7.8 Bed gap removal
Pull the taper pins (A, Fig 21) by tightening the hex nuts.
Remove the screws (B).
Bed gap can now be removed.
Before you install the bed gap, clean the contacting surfaces
thoroughly.
Remove nuts form the taper pins.
Slide taper pins into the holes and seat using a mallet.
Tighten the screws.

8. Maintenance and inspection

General notes:
Maintenance, cleaning and repair work may only be
carried out after the machine is protected against
accidental starting.
Turn off the main switch and press the emergency stop
button.
Clean the machine regularly.
Defective safety devices must be replaced immediately.
Repair and maintenance work on the electrical system may
only be carried out by a qualified electrician.
8.1 Annual Lubrication
- Headstock:
Change the hydraulic oil
(GH 1640 ZX....8 Liter)
(GH 1840/ 1860/ 1880 ZX....12Liter)
(GH 2260/ 2280 ZX....16 Liter)
14
Fig 21