4-11. DRIVE BELT REPLACEMENT (Figure 4-11)
A.
Belt Removal
The turntable spindle must be in a raised position to
allow replacement of the drive
belt. To ease lifting the
spindle and prevent damaging turntable components,
it
will be necessary to retract the locking pin to release the
mounting plate from its secured position (locking pin in
the down position).
WARNING:
ELECTRIC SHOCK can kill; MOVING
PARTS can cause serious injury.
•
Do not touch live electrical parts.
•
Keep clear of pinch points.
Turntable operation
is
required
to retract locking pin
from securing
mounting plate position.
1. Turn on turntable input power (energize welding
power source if it is equipped with a 115 volts ac
receptacle that supplies turntable input power).
2.
Open hinged front cover on turntable control
panel and momentarily connect a jumper lead to
leads 30 and 32 at terminal strip to retract lock-
ing pin from securing mounting plate position.
3.
Close and secure cover on control panel.
4.
Shut down input power supply to turntable.
5.
Remove front, rear, and left side covers from
turntable chassis.
7.
Loosen the 4 nuts securing rotary actuator
mounting plate to turntable base.
~
ELECTRIC
SHOCK can kill.
•
Do not touch live electrical parts.
•
Shut down turntable, welding power source, and
robot control,
and disconnect input power
employing “lockout/tagging procedures” before
inspecting or servicing.
Lockout/tagging procedures consist of removing plug
from receptacle, padlocking line disconnect switch in
open position, removing fuses from fuse box, or shut-
ting off and red-tagging circuit breaker or other discon-
necting device.
MOVING PARTS can cause serious injury.
•
Keep clear of pinch points.
PRESSURIZED
HYDRAULIC FLUID
can cause
serious injury.
•
Release hydraulic fluid pressure according to Sec-
tion 4-73 before touching any hydraulic com-
ponents.
Hydraulic fluid pressure is present even though elec-
trical power is disconnected.
IMPORTANT:
Releasing drive belt tension when
locking pin is not securing mounting plate will allow
spindle to move slightly away from hard stop and shock
absorber at the knocker block location.
8.
Loosen tension adjustment bolt, located on left
side of rotary actuator mounting plate, to release
belt tension.
9.
Remove belt from drive pulley on rotary ac-
tuator.
10.
Loosen setscrew in upper and lower bearing col-
lars.
TB-120 281
6.
Press the push button on top of the motor/pump
adapter to release pressurized fluid from ac-
cumulator and check for a zero (0) reading at
pressure switch gauge.
Drive
Belt
Pad
Adjustment Bolt
Figure 4
-
11.
Components For Turntable Drive Assembly
OM-890 Page 22
