14 • Snap-on
Brake Lathes
Maintenance and
Service
Oiling
The bare metal parts are coated with an oil-soluble
rust preventative. It is not necessary to clean the rust
preventative from these parts. Before using the lathe,
all bare metal parts should be wiped down with an
oiled rag. Use a light machine oil for the initial and daily
wipe downs when oiling the exposed bare metal
parts. Do not oil the tool bar clamping surfaces on top
of the slides.
Lead Screw Drive:
Apply light machine oil to the
bronze bushing at the end of the lead screw.
Felt Wipers:
Apply light machine oil to the felt way
wipers.
Cleaning
Keep the lathe as clean as possible for trouble free
operation as well as safety and longer lathe life. Use a
brush to sweep metal chips and dust off the lathe. DO
NOT USE COMPRESSED AIR TO BLOW THE LATHE
CLEAN as chips and dust may be driven between
machined parts and into the ways causing undue
wear. Wipe dust and chips from the slide clamping
surfaces before installing the tool bars.
Care of Arbors and Adaptors
Although the adaptors, arbors, and the
spindle are made of top grade steel and are
turned, hardened, and precision ground to
close tolerances, great care should be taken
in their use, handling, and storage. Even
the smallest nick, scratch, or nose chip can
cause incorrect rotor or drum alignment,
resulting in inaccurate machining.
Remove all adaptors from the arbor after machining a
drum or rotor and wipe them clean—especially the
inboard adaptor. When a finished drum or rotor is
removed from the arbor, the inboard adaptor may
move slightly away from the face of the arbor and
allow metal chips to fall into the opening causing a
poor mounting for the next drum or rotor.
Regularly inspect the faces and seating tapers of the
adaptors for nicks and scratches; correct any flaw with
a fine stone. If the damage cannot be corrected,
replace the adaptor. Handle the adaptors and arbors
with care and store them on individual hooks. DO NOT
throw them into a box. The adaptors are designed for
mounting drums and rotors only, DO NOT misuse the
adaptors.
Spindle V-belt Replacement
1.
Disconnect the lathe from the power source.
2.
Remove the two (2) screws securing the drive
belt cover and remove the cover.
3.
Remove the two (2) nuts and washers from the
studs supporting the idler bracket tension screw, and
completely back off the idler bracket tension screw.
Slide the idler bracket off the studs and the pulleys out
of the timing belts. Remove the timing belts from the
spindle pulleys.
4.
Loosen, but do not remove the four (4) screws
securing the motor to the main frame. Lift the motor
and remove the V-belt.
5.
Hang the new V-belt in the spindle pulley, lift the
motor and slip the belt into the motor pulley. Adjust
the V-belt tension as described in SPINDLE V-BELT
ADJUSTMENT below.
6.
Hang the timing belts on the spindle pulleys and
replace the idler bracket assembly. Lift the idler
bracket to slide the timing belts onto the idler pulleys.
7.
Replace the washers and nuts on the idler
bracket studs. Use a wrench to tighten the nuts, then
back the nuts off 1/4 to 1/2 turn. Adjust the timing belt
tension as described in SPINDLE TIMING BELT
ADJUSTMENT below.
8.
Install the drive belt cover, and secure it with two
(2) screws and washers.
Spindle V-belt Adjustment
1.
Disconnect the lathe from the power source.
2.
Remove the two (2) screws and washers secur-
ing the drive belt cover and remove the cover.
3.
Loosen the four (4) motor mount screws to allow
the weight of the motor to rest on the V-belt.
4.
Use a finger to press the V-belt in about 1/4" on
the left side, between the motor pulley and the spin-
dle.
5.
Tighten the motor mount screw to the left while
maintaining the 1/4" deflection. Tighten the other
motor mount screws.
CAUTION
