521B and 522B Track Feller Bunchers Machine Systems Caterpillar


Boom Cylinder - Remove and Install

Usage:

521B F7B

Removal

Table 1
Required Tools 
Tool  Part Number  Description  Qty 
140-7742  Sleeve 


NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.

Dispose of all fluids according to local regulations and mandates.


------ WARNING! ------

Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed.

Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death.

Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.




    Illustration 1g00810542

  1. Position the felling head into a horizontal position, as shown.


    Illustration 2g01024461

  2. Attach a suitable lifting device with Tooling (A), as shown. Remove the hose assembly (not shown) from the rod end of the boom cylinder. Remove bolt (1) and pin (2).

  3. Start the machine and retract the boom cylinder. Lower the rod end of the boom cylinder onto a suitable support.


    Illustration 3g01024475

  4. Disconnect hydraulic hose assemblies (3) and (4).


    Illustration 4g01024484

  5. Attach a suitable lifting device to boom cylinder (5). Remove bolt (6) and pin assembly (7). Remove boom cylinder (5). The weight of the boom cylinder is approximately 275 kg (600 lb).

Disassembly and Assembly

Table 2
Required Tools 
Tool  Part Number  Part Description  Qty 
127-4904  Repair Stand 
195-4609  Seal Pick 
4C-4032  Bearing Mount Compound   
5P-0960  Molybdenum Grease   
9U-5337  Bearing Puller Adapter 
4C-9634 Puller Stud 
9U-6832 Full Nut 
9S-5564 Pin Puller Sleeve As 
6V-3175 Double Acting Cylinder 
350-7768 Electric Hydraulic Pump Gp 115 
350-7769 Electric Hydraulic Pump Gp 230 
1P-0520  Driver Gp 


Illustration 5g01026707

(1) Torque for the nut ... 7600 ± 380 N·m (5605 ± 280 lb ft)

(2) Torque for the bolts ... 460 ± 60 N·m (340 ± 45 lb ft)

(3) and (4) The distance from the edge of the bearing to the edge of the eye ... 003.5 ± 000.3 mm (.1378 ± .0118 inch)

Apply Tooling (D) to seals (5).

Lubricate seals (6) with the lubricant that is being sealed.

Installation



    Illustration 6g01024484

  1. Attach a suitable lifting device to boom cylinder (5). Install head end of boom cylinder (5). The weight of boom cylinder (5) is approximately 275 kg (600 lb). Install pin assembly (7) and bolt (6).


    Illustration 7g01024475

  2. Connect hose assemblies (3) and (4).


    Illustration 8g01024461

  3. Attach a suitable lifting device with Tooling (A), as shown. Raise rod end of boom cylinder (5) into position. Start the machine and extend rod end of boom cylinder (5) until rod eye is in line with bore of boom. Install pin assembly (2) and bolt (1). Install hose assembly not shown) to rod end of the boom cylinder (5).

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