Lull 6K Service Manual - Manual (Page 555)

Transmission
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 8-7
ZF Transmission with DW-3 Shifter
6K-37 (S/N 398–)
6K-42 (S/N 132–)
644B-37 (S/N 881–)
644B-42 (S/N 242–)
8K-42 (S/N 262–)
844C-42 (S/N 784–)
10K-42 (S/N 108–)
10K-54 (S/N 108, 110–)
1044C-42 (S/N 122–)
1044C-54 (S/N 216–) If an electrical supply problem is suspected, the operator may also
experience circuit failures, alternator/charging problems, or starting
problems. These problems should be addressed and corrected prior to
proceeding with diagnosis of the ZF transmission electrical system. Once
this is done, proceed with the following steps:
1. Check battery integrity to ensure that it has not discharged.
2. Check battery cable connections.
3. Check 30 amp circuit breaker to ensure that it is not defective or stuck
in open position.
4. Check battery post connection at ignition switch.
5. Check the ignition switch as follows:
a. With the ignition switch in the “OFF” position, only the Bat. Post
should be active.
b. With the ignition switch in the “ACC” position, only the Bat. Post
and the Acc. Post should be active.
c. With the ignition switch in the “ON” position, only the Bat. Post,
Acc. Post, and the Ign. Post should be active.
d. With the ignition switch in the “ST.” position, only the Bat. Post, Ign.
Post, and St. Post should be active.
6. Check ignition switch relay (if equipped).
7. Check 7.5 amp fuse and fuse holder.
8. Check park brake pressure switch, service brake pressure switch, and
proximity switch. See pages 8-17, 8-18, and 8-20.
DW-2 Shifter System Tests
644B-37 (S/N 101–880)
6K-37 (S/N 101–397)
6K-42 (S/N 101–131)
644B-42 (S/N 101–241)
844C-42 (S/N 101–783)
8K-42 (S/N 101–261)
1044C-42 (S/N
101–121)
10K-42 (S/N 101–107)
1044C-54 (S/N 101–25)
10K-54 (S/N 101–107,
109)
DW-2 Speed Range/Direction Signal Test
1. Park the machine on level ground, lower the boom, and block the
wheels.