- Off-Highway Truck/Tractor:
- 784B (S/N: 5RK1-UP)
784C (S/N: 2PZ1-UP)
785 (S/N: 8GB1-UP)
785B (S/N: 6HK1-UP)
785C (S/N: 1HW1-UP; APX1-UP)
785C HAA (S/N: 5AZ1-UP)
789 (S/N: 9ZC1-UP)
789B (S/N: 7EK1-UP)
789C (S/N: 2BW1-UP)
793 (S/N: 3SJ1-UP)
793B (S/N: 1HL1-UP)
793C (S/N: 4AR1-UP; 4GZ1-UP; ATY1-UP)
797 (S/N: 5YW1-UP)
Service Magazine SEPD0608, 10 December 2001, "New Slack Adjusters are Used for Improved Service Life". The effectivity of this article has changed and additional part numbers are available. Disregard this article. Replace the article with the following article.
Description of Change: The new slack adjusters contain a new piston assembly. New tooling is available for the assembly of the piston assembly. The new tooling and the new piston assembly will increase the service life of the slack adjusters.
Adaptable To: The new adjuster groups are direct replacements for the existing adjuster groups. The new adjuster groups use the new 205-0561 Piston. The new piston is serviced by the new 205-0567 Repair Kit (Piston). The new adjuster groups are effective with the following machines: 784C (S/N: 2PZ1), 785C (S/N: APX295), 785C HAA (S/N: 5AZ274), 789C (S/N: 2BW551) and 797 (S/N: 5YW256). The adjuster groups are adaptable to all earlier machines by using the 205-0567 Repair Kit (Piston). Refer to Table 1 for the new part numbers and for the existing part numbers.
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Table 1
| Sales Model |
Location |
New Part Number |
Description |
Former Part Number |
784
785 |
Front |
205-0557 |
Adjuster Gp |
2G-6535 |
| Rear |
205-0559 |
Adjuster Gp |
6G-9881 |
| 789 |
Front |
205-0558 |
Adjuster Gp |
2G-5900 |
| Rear |
205-0560 |
Adjuster Gp |
5T-7670 |
793
797 |
Front |
205-0559 |
Adjuster Gp |
6G-9881 |
| Rear |
205-0560 |
Adjuster Gp |
5T-7670 |
| |
|
205-0561 |
Piston |
9V-3222 |
| |
|
205-0567 |
Repair Kit (Piston) |
9V-3225 |
The new
209-6381 Seal Installer Gp is used to assemble the two-piece seal assembly into the large O-ring groove of the new piston.
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|
 |
|
| Illustration 1 | g00807480 |
(A) 207-3440 Mandrel
(B) 207-3442 Seal Installer
(C) 207-3444 Seal Installer Sleeve
|
The 209-6381 Seal Installer Gp consists of the following three components: 207-3440 Mandrel, 207-3442 Seal Installer and 207-3444 Seal Installer Sleeve .
The following procedure demonstrates the proper use of the 209-6381 Seal Installer Gp.
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Table 2
| Required Tools |
| Tool |
Part Number |
Part Description |
Qty |
| A |
207-3440 |
Mandrel |
1 |
| B |
207-3442 |
Seal Installer |
1 |
| C |
207-3444 |
Seal Installer Sleeve |
1 |
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|
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|
| Illustration 2 | g00807514 |
- Install seal (1) onto piston (2) .
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|
| Illustration 3 | g00807543 |
- Install ring (3) onto piston (2) .
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|
| Illustration 4 | g00807548 |
- Position Tool (A) onto piston (2), as shown. Push O-ring seal (4) down Tool (A) and into the groove of piston (2), as shown.
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|
| Illustration 5 | g00807554 |
- Position seal (5) onto Tool (A), as shown. Use Tool (B) to slide seal (5) down Tool (A). Seal (5) is fully installed when O-ring seal (4) is completely covered.
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|
| Illustration 6 | g00807561 |
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|
| Illustration 7 | g00807563 |
- Push piston (2) into Tool (C), as shown.
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|
| Illustration 8 | g00807567 |
- Stop pushing piston (2) when piston (2) is halfway inside of Tool (C). Leave piston (2) in this position for at least 1 minute.
Note: Tool (C) forces the seals inward. This will ease the installation of piston (2) .
- After 1 minute, remove piston (2) from Tool (C) .
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|
| Illustration 9 | g00807572 |
- Install spring (6) and spring (7) into piston housing (8) .
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|
| Illustration 10 | g00807574 |
- Install piston (2) into piston housing (8), as shown.
Note: Piston (2) should be installed into piston housing (8) soon after piston (2) is removed from Tool (C) .
