BELLOWS AS 4493662 - Caterpillar

This inspection can be repeated every 1000 hours until a PCA is identified. Inspecting the system at this frequency may not be required. It is dependent on the severity of the application in which the machine is operating. The letter may be claimed each time the machine is inspected until a permanent corrective action is identified.
Inspecting powered access stairway components is a 1.0 hour job.
Replacing handrail bushings and hardware is a 3.5 hour job.
Replacing pivot bearings, shaft, and crank is a 7.0 hour job.
Replacing the hydraulic cylinder group is a 4.0 hour job.
Replacing the pipe assemblies is a 2.0 hour job.
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
*******Group 3*******
0-60000 hrs,
0-120 mo 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 1.0-hour job for Group 3
This inspection can be repeated every 1000 hours until a PCA is identified. Inspecting the system at this frequency may not be required. It is dependent on the severity of the application in which the machine is operating. The letter may be claimed each time the machine is inspected until a permanent corrective action is identified.
Inspecting powered access stairway components is a 1.0 hour job.
Replacing handrail bushings and hardware is a 3.5 hour job.
Replacing pivot bearings, shaft, and crank is a 7.0 hour job.
Replacing the hydraulic cylinder group is a 4.0 hour job.
Replacing the pipe assemblies is a 2.0 hour job.
PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Rework Procedure
Refer to the Service Manual if/as necessary.
If the button head screws are found loose/missing or the handrail
bushings allow the handrails to become noticeably loose when boarding
the machine replace the bushings and associated hardware if/as
required.
(1) 336-7053 Bushing 4 Per Side Of Handrail
(2) 8C-8585 Button Head Screw 4 Per Side Of Handrail
(3) 9X-2027 Washer 4 Per Side Of Handrail
(4) 336-7076 Bushing 1 Per Side Of Handrail
(5) 336-7079 Bushing 1 Per Side Of Handrail
(6) 8T-9336 Socket Set Screw 6 Per Side Of Handrail
Image1.1.1
If the main pivot bearings and shaft fail replace if/as necessary.
(7)3553122/">355-3122 Special Bearing
(8)3281198/">328-1198 Shaft
(9)3393275/">339-3275 Cylinder Gp.
Note: Image 1.2.1 is the platform assembly with the cover removed.
Image1.2.1
If the pipe assemblies on the handrails fail replace if/as necessary.
(10) 3408869/">340-8869 (Group 1) 3485587/">348-5587 (Group 2 & 3) Pipe As.
Image1.3.1