New Connectors Are Used on Certain C-Series Knuckleboom Loader Stabilizer Lines {5057} Caterpillar

New Connectors Are Used on Certain C-Series Knuckleboom Loader Stabilizer Lines {5057}

Usage:

559C KAS

Knuckleboom Loader: 2384C (S/N: KB61-UP; KAW1-UP); 2484C (S/N: KB71-UP; KAZ1-UP); 559C (S/N: KB41-UP; KAS1-UP); 579C (S/N: KB51-UP; KAX1-UP)

Description Of Change: New connectors are now used on certain Knuckleboom Loader stabilizer lines. The new connectors are used to eliminate unnecessary check valves.

Adaptable To:

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Table 1
Required Parts
Item	Qty	Part Number	Description
1	2	5K-9090	O-Ring Seal
2	2	6V-8635	Connector
3	2	7M-8485	O-Ring Seal

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Table 2
Sales Model	Adaptable to	Effective with
2384C	S/N:KAW1-318	S/N:KAW319-UP
2384C	S/N:KB61-389	S/N:KB6390-UP
2484C	S/N:KAZ1-264	S/N:KAZ265-UP
2484C	S/N:KB71-314	S/N:KB7315-UP
559C	S/N:KAS1-549	S/N:KAS550-UP
559C	S/N:KB41-435	S/N:KB4436-UP
579C	S/N:KAX1-295	S/N:KAX296-UP
579C	S/N:KB51-152	S/N:KB5153-UP

The connectors are adaptable to and effective in production with the machines listed in Table 2.

To adapt a machine in the adaptable population, follow the rework procedure below.

Rework Procedure

Vent the pressure from the hydraulic oil tank.
Install a vacuum device on the hydraulic oil tank to prevent oil loss.
Access the bottom of the hydraulic swivel from below the machine. Clean all hoses, fittings, and tubes in this area.
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Illustration 1 g06050075

View of swivel area under machine
(A) 415-9440 Tube As
Remove all hoses mounted to tube assembly (A) and plug for contamination control.
Remove tube assembly (A).
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Illustration 2 g06050087

View of swivel area under machine
(B) 111-1460 Check Valve
Remove check valves (B).
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Illustration 3 g06050106

View of swivel area under machine
(1) 5K-9090 O-Ring Seal
(2) 6V-8635 Connector
(3) 7M-8485 O-Ring Seal
Install two connectors (2) using seals (1) and (3) into the swivel.
Reinstall tube assembly (A) and all hoses.
Vent the hydraulic oil tank and start machine to check for leaks.
Operate each stabilizer cylinder at least six times to the fully extended and retracted position. Bring the stabilizer pad to the ground with no machine weight on the stabilizers.
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Illustration 4 g06050151

View of right rear stabilizer
(C) Purge plug
Remove purge plug (C) at the base of each cylinder one at a time and vent any air trapped in these cylinders. Be careful when removing the plugs for any trapped pressure left in the cylinders. Once the plug has been removed, use a small oil can and fill the cylinder with hydraulic fluid and reinstall the plug. Repeat this process on all stabilizer cylinders.
Once all cylinders have been purged, repeat Steps 10 and 11.
Note: Continue until all air has been worked out of the lower hydraulic system and cylinders. When removing the purge plug and no air or void is present, the cylinders have been purged completely.

If the air has been purged properly, maximum cylinder rod movement inward under heavy loads will be 9.5 mm (0.375 inch). If the cylinder is compressing more than 9.5 mm (0.375 inch), the cylinder should be purged again and condition of the lock valve should be evaluated.