International Bulletin No: CHALL 09/10
Distribution
Section 10-0075
CHALLENGER SERVICE BULLETIN
Issue: 1
Date: April 2010
MT700C/MT800C SERIES TRACKED TRACTOR
COUPLER HOUSING REPLACEMENT - RP6378
Advice
In some isolated cases the implement valves on the C-Series Tracked Tractors have
potential for the quick couplers to become detached from the valve body when
pressurized. This due to the spiral snap ring groove being incorrectly machined
preventing the snap ring from holding the coupler in place. All units built with the
suspected coupler housing machining errors are being updated with correctly
machined coupler housings included coupler rework kits identified beedlow. Follow
the procedure outlined below to complete the updates on these units.
Poppet Valve update will also be included for RP6378 coupler housing replacement
to prevent need for duplicate repairs. Poppet valves RP for other C Series machines
will be released when adequate parts supply are available for all other C Series
machines.
Serial Numbers Involved
Models Serial Numbers
MT700C See Appendix A
MT800C See Appendix A
MTS800C See Appendix A
Parts Involved
Part Number Quantity Description
544068D1 1 4 Valve Coupler Rework Kit
544069D1 1 5 Valve Coupler Rework Kit
544070D1 1 6 Valve Coupler Rework Kit
543030D1 8-12 See Note Below Poppet Valve Kit
543029D1 1 Hitch Valve Poppet Kit
AGCO Limited
Registered Office: Abbey Park Stoneleigh Kenilworth England CV8 2TQ
Telephone: 024 76694400 Fax: 024 7652495 Registered No. 509133 England www.challengerag.com
Challenger is a worldwide brand of AGCO.
Page 2 of 14 CHALL 09/10
NOTE:
If machine has a 4 section valve stack you will need to order 8 Poppet Valve Kits
(543030D1).
If machine has a 5 section valve stack you must order 10 Poppet Valve Kits
(543030D1).
If machine has a 6 section valve stack you must order 12 Poppet Valve Kits
(543030D1).
Also if machine has a 3 point. hitch then you must order 1 Hitch Valve Poppet Kit
(543029D1).
If any of these tractors have field installed sections, that coupler block will not need
to be replaced.
Action
1. If the tractor falls into the serial number list, order the correct kit for the
tractor. In this kit there is a top, middle, and bottom coupler housing. These
will be labelled as to the correct section.
2. Clean implement valve and coupler housing sections as clean as possible to
prevent possible contamination of hydraulic components during repair.
3. Remove (6) screws from each coupler dust cover, indicated by red arrows in
Figure 1, also the covers from the stack.
Figure 1
Page 3 of 14 CHALL 09/10
4. Next remove the snap ring holding in the remote couplers on each side. See
Figure 2.
Figure 2
5. By depressing the coupler handle, remove each coupler from the stack.
6. Once all the couplers have been removed, the coupler handles need to be
removed by removing the snap ring holding the handle in place. See Figure 3.
NOTE: Three point hitch arms can be lifted with hoist or lift to allow access to
remove all coupler handles.
Figure 3
Page 4 of 14 CHALL 09/10
7. Using a 3/16 hex remove each plug on the left hand side of the section. See
Figure 4.
Figure 4
8. Using a 5mm hex remove the short bolt positioned behind the plug removed
in the previous step. See Figure 5.
Figure 5
Page 5 of 14 CHALL 09/10
9. With the same size hex continue with removing the long bolt on the right hand
side of the valve. See Figure 6.
Figure 6
10. Next with a 14mm hex remove the lock-out assemblies from inside the
coupler block. See Figure 7.
Figure 7
Page 6 of 14 CHALL 09/10
11. Once the lock-out assemblies are removed, then the coupler is loose, remove
the coupler, as seen in Figure 8.
Figure 8
12. Once you have removed the lock-out assemblies and the coupler housing, the
poppet valve and spring indicated by red arrows in Figure 9 can be removed by
using a magnet to pull out of the spring and valve.
Replace poppet valves
with the kit ordered
Figure 9
Page 7 of 14 CHALL 09/10
13. Remove alignment sleeves from the bottom of the coupler block as seen in
Figure 10. Re-install them into the main body.
Figure 10
14. Install the sump fitting into the bottom coupler block as indicated by red arrow
in Figure 11. The bottom coupler block has a cast surface, also labelled
“bottom”. Re-install the O-ring on coupler drain port.
Figure 11
Page 8 of 14 CHALL 09/10
15. Install the bottom coupler block using the lock-out assemblies and torque to
81 ± 8 Nm (60.0 ± 6.0 lb-ft) as seen in Figure 12.
Figure 12
16. Install the remaining coupler blocks including the sump O-ring as seen in
figure 13.
Figure 13
Page 9 of 14 CHALL 09/10
17. Install the couplers into all the blocks. Ensure the couplers are installed fully
into the bore and the snap ring is visible and not restricted. See Figure 14.
18. Install the snap ring fully inside the groove.
Figure 14
19. Install the short bolt on the left side of the section and torque to 9.5 ± 1 Nm
(7.0 ± 1 lb-ft) as seen in Figure 15.
Figure 15
Page 10 of 14 CHALL 09/10
20. Install the long bolt on the right side of the section and torque to 9.5 ± 1 Nm
(7.0 ± 1 Ft-lb). See Figure 16.
Figure 16
21. Install all SAE plugs on the left side of the section and torque to 19 ± 2 Nm
(14.0 ± 1.5 Ft-lb). See Figure 17.
Figure 17
Page 11 of 14 CHALL 09/10
22. Install all coupler handles as seen in Figure 18.
Figure 18
NOTE: Three point hitch arms can be lifted with hoist or lift to allow access to
reinstall all coupler handles.
23. If MT700 tractor is equipped with a three point hitch remove 90 degree fitting
illustrated as number 1 in Figure 19, then remove Connector fitting 2 to gain
access to the poppet assembly.
Figure 19
Page 12 of 14 CHALL 09/10
24. Remove poppet retaining plug (1) in Figure 20. Use a magnet to replace spring
(2) and hitch poppet valve (3) in hitch valve. Install new poppet valve, spring
and plug.
Figure 20
25. Install the coupler drain hose.
26. To ensure the couplers seat correctly, pressurise each coupler to inspect for
leakage with a hose connected to that coupler only not looped for flow.
27. Test to ensure the poppet functions correctly. A looped line with a pressure
gauge can be used to ensure the return poppet opens correctly, this needs to
be done in both directions.
28. Install section location bracket to the coupler block. See Figure 21.
Figure 21
Page 13 of 14 CHALL 09/10
29. Install screws into the coupler cover and torque to 5 ± 0.5 Nm (3.6 +/- 0.3 lb-ft)
torque specification.
Warranty Information
RP number: RP6378
Causal part number: 532408D1
Labour rate code: R6378A – 1.2hours (4 section stack)
R6378B – 1.5hours (5 Section stack)
R6378C – 1.8hours (6 section stack)
All claims to be submitted by
Additional information
Warranty claims must indicate the cost of parts identified as required on this
bulletin and allowable labour. Any additional warranty work must be submitted on a
separate claim.
This programme must be completed 100%.
Travel Allowance
Claim one (1) additional hour of labour for travel on warranty registered retailed
machines only.
Page 14 of 14 CHALL 09/10
Serial Numbers Involved
Appendix A
C0765ANUCA1259
C0765CNUCA1503
C0765CNUCA1520
C0765CNVCA1018
C0765CNVCA1052
C0765ENUCA1315
C0765ENUCA1430
C0765HNVCA1050
C0765JNVCA1011
C0765KNUCA1420
C0765KNUCA1496
C0765KNVCA1024
C0765LNUCA1439
C0765LNUCA1473
C0765LNUCA1554
C0765TNVCA1053
C0765VNVCA1044
C0765ANUCA1438
C0765CNUCE1346
C0765CNVCA1004
C0765HNVCA1064
C0765KNVCA1041
C0765TNUCA1379
C0765VNUCA1423
Yours faithfully
David Mckay
Technical Service Specialist—Challenger
This bulletin is for technical information only and does not constitute authority for
warranty claims.
Bulletin source DM
© 2010 AGCO Corporation
