Kohler KGP, Manual

Page: 82 / 126

TP-6461 1/08 82 Section 5 Component Replacement, Model KGS/KGP
Replacing Contact Assembly 1600--2000 Amp
Models
Refer to Figure 5-6 and Figure 5-7 for the following
procedure:
1. Prespring gap
2. Arc finger adjustment nut
3. Main contacts 4. Arc finger
5. Spring gap
6. Arcing contacts
566862
6
3
2
1
5
4
Figure 5-7 Contact Adjustment
1. Secure the new movable contact assembly with
the pivot studs, locknuts, and lock washers.
2. Torque the locknuts to 13.6 Nm (10 ft. lb.).
3. Secure the braid lug with the braid lug bolts and
compression washers.
4. Torque the bolts to 31.2 Nm (23 ft. lb.).
5. Connect the actuator arms to the contact posts and
secure with the two retaining rings.
6. Manually close the contacts slowly until the arcing
contacts touch. The main contacts should have
6.35 mm (1/4 in.) minimum gap. If not, adjust the
arc finger adjustment nut as required.
If the
contacts cannot be brought within specifications,
reject the contact assembly.
7. Measure and record the gap at the prespring gap.
8. Close the contacts fully.
9. Rock the arcing contact from toe to heel and verify
that there is a 0.0762 mm (0.003 in.) minimum gap
at the arcing contacts. The feeler gauge must enter
1.59 mm (1/16 in.) past the edge of the silver.
10. The spring gap dimension must be 1.59 mm
(1/16 in.) less than prespring gap measured in
step 7. If the contacts are not within specs, reject
the contact assembly.
11. Check that the contact pressure of each of the
three outside main contacts is between 1.7--2 kg
(3.75--4.5 lb.).
12. Check that the contact pressure of the arc finger is
between 4--6.4 kg (9--14 lb.).
13. Check that both main and arc contact fingers are
not bottomed out when closed.
14. Secure the arc chute and arc chute pad with the two
machine screws.
15. Check the operation of the transfer switch by
manually opening and closing the switch
assemblies.
16. Reinstall and secure the blue plastic cover.
17. Close cabinet door.
18. Reconnect the normal power source and the
emergency power source. If a generator set is the
emergency power source, connect the negative (--)
battery cable to the starting battery and place the
generator set master switch in its original position.
19. Test the switch for proper operation.