Jet 719600, Operating Instructions And Parts Manual

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10.0 User-maintenance
Before doing maintenance on
the lathe, disconnect it from the electrical
supply by pulling out the plug or switching off
the main switch. Failure to comply may cause
serious injury.
10.1 General procedures
Maintenance on the JWL-1840EVS and JWL-
1840DVR lathe should be performed at periodic
intervals to ensure that the machine is in proper
working order, that all fasteners are tight, and all
necessary adjustments have been made.
Inspection and maintenance should be performed
at least twice a year, but more frequently if the
lathe receives constant use.
Clean and oil the lathe bed so that headstock,
tailstock and tool rest base will slide easily. Clean
any rust spots that may develop on the bed with a
commercial rust remover.
Use compressed air to blow out the interior of the
headstock, in order to keep sawdust and chips
from accumulating on belts and sheaves. Also blow
off debris that accumulates in the motor fan and
around inverter.
Do not disassemble inverter to
clean!
Frequently clean out the Morse tapers on both
headstock and tailstock. Commercially available
taper cleaners may be acquired from tool stores.
Bearings are permanently lubricated and sealed,
and do not require further lubrication.
10.2 Pulley and belt alignment
The motor and spindle pulleys are aligned with
each other by the manufacturer, but if any service
is performed that affects their alignment it is very
important that they be realigned. Engage spindle
lock, loosen two set screws on spindle pulley (E,
Figure 9-12) with 3mm hex key, and slide spindle
pulley into proper position. Retighten set screws,
and disengage spindle lock.
When pulleys and belt are properly aligned, there
should be no unusual pulsing sounds or noise
coming from the belt.
10.3 Pulley and belt replacement
See Figure 9-12.
3mm hex key required.
To change out a belt or pulley, carefully proceed as
follows. If you are uncertain about attempting a belt
or pulley change-out, contact JET technical service
or take the headstock to an authorized service
center.
1. Disconnect lathe from power source.
2. Loosen pivot lock handle (A, Figure 9-12) and
lift up tension handle (B) to raise motor.
3. Tighten pivot lock handle (A) to secure motor
in raised position.
4. Slip belt off pulleys.
5. Loosen two set screws on handwheel (C).
6. Engage spindle lock (D) and unscrew
handwheel from spindle (left-hand threads,
clockwise to loosen).
7. Slide spindle a little way out of headstock, just
enough to remove pulley or belt.
NOTE: If needed, tap end of spindle with a
wood block or rubber mallet to move it. Do
NOT use a steel face hammer directly against
spindle.
8. If replacing a pulley, loosen both set screws
(E), and slide pulley off spindle.
9. Install new pulley, loosely securing the two set
screws. Make sure pulley is oriented properly
and key is inserted properly in spindle groove.
10. Slide spindle back into place.
11. Reinstall handwheel (C) and tighten set
screws.
12. Align new pulley (see sect. 10.2 ) then tighten
both set screws securely on pulley.
13. Loosen pivot lock handle (A) and lower motor
using tension handle (B). Re-tighten pivot lock
handle.
14. Disengage spindle lock.
Figure 9-12