D7E Track-Type Tractor Power Train Recoil Cylinder - Assemble Caterpillar


Recoil Cylinder - Assemble
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Assembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
152-4252  Hydraulic Repair Bench 
175-5507  Nitrogen Charging Group 
338-0500 Regulator Assembly 
346-3622 Relief Valve 
8T-0372  Bolt 
1H-3109  Leg 
5F-9887 Adapter 
5P-4807 Cap 
- 1 1/2" Socket 1" Drive 
9U-5919  Spanner 
209-6756 Clamp As 
4J-2620 Wear Ring 
9X-3579 Wear Ring 
8T-7850 Wear Ring 
FT-3233  Spanner Wrench As. 
5P-3521 Pin 
5P-3522 Pin 
FT-3144  Seal Installer 
1U-9891  Hydraulic Oil Additive(1) 
FT-3234  Piston Sleeve 
Loctite 243 
(1) Mix one part Additive with two parts clean 10wt Hydraulic Oil.


    Illustration 1g03502502


    Illustration 2g03502403

  1. Use Tooling (G) to install scraper seal (27) into cap assembly (26). Install O-ring seal (28) and backup rings (29) into cap assembly (26).

  2. Clean the threads of cap assembly (26). Lubricate O-ring seal (28) with Tooling (H).

  3. Use Tooling (F) and the hydraulic repair bench to install cap assembly (26). Tighten cap assembly (26) to a minimum torque of 300 N·m (220 lb ft).


    Illustration 3g03502309

  4. Install O-ring seal (19) and backup ring (20) into piston assembly (17). Lubricate O-ring seal with Tooling (H).


    Illustration 4g03502332


    Illustration 5g06012716


    Illustration 6g03507586

  5. Install wear band (21) and (22), backup rings (23), T seal (24), and wear band (25) onto piston (17).

  6. Secure rod assembly (16) and Tooling (E) to the hydraulic repair bench.

  7. Install piston assembly (17) onto rod assembly (16). Tighten piston assembly (26) to a minimum torque of 300 N·m (220 lb ft) until setscrew (18) can be installed.

    Note: Cylinder groups that did not include a spring pin or setscrew (18) or had a spring pin previously installed must Refer to Special Instruction, REHS8537, "Installation Procedure for Installing Spring Pins in the Recoil Cylinder of Certain D7E Track-Type Tractors".



    Illustration 7g03818600

  8. Apply Tooling (K) to setscrew (18) and install. Torque to 20 ± 1 N·m (175 ± 8 lb in) . Stake the internal threads at three equally spaced locations as shown in Illustration 7. Allow 1 hour of cure time before proceeding to Step 9 or handling the piston assembly.

  9. Remove piston assembly (17) and rod assembly (16) from the hydraulic repair bench. Remove Tooling (E) and Tooling (F).


    Illustration 8g06012730

  10. Secure cylinder (1) to the hydraulic repair bench. Install Tooling (J) and lubricate with Tooling (H).


    Illustration 9g06012733

  11. Install rod assembly (16) and piston assembly (17) into Tooling (J) and cylinder (1).


    Illustration 10g06012812

  12. Use Tooling (D) and the hydraulic repair bench to push the head assembly and rod assembly into cylinder (1).

    Note: To prevent damage to cylinder (1) wrap Tooling (D) with padding (as shown).



    Illustration 11g03501201

  13. Install O-ring seals (15) onto spacer (14).

  14. Lubricate O-ring seals (15) with Tooling (H) and install spacer (14) into the cylinder.


    Illustration 12g03507637

  15. Install O-ring seal (12), and backup ring (11) into head assembly (9). Lubricate O-ring seal (11) with Tooling (H).


    Illustration 13g03483582

  16. Use Tooling (B) and the hydraulic repair bench to install head assembly (9) into cylinder (1). Tighten head assembly (9) to a minimum torque of 300 N·m (220 lb ft).


    Illustration 14g03507647

  17. Install O-ring seal (10) onto head (9).


    Illustration 15g03507655

  18. Add 236.8 mL (8.0 oz) of Tooling (H) through the center hole in head (9) into the cylinder.


    Illustration 16g03507682

  19. Install manifold (5), bolts (7), bolts (8), and spring pin (6).

    Note: Cylinder groups that do not include spring pin (6) or holes for spring pin (6) Refer to Special Instruction, REHS8537, "Installation Procedure for Installing Spring Pins in the Recoil Cylinder of Certain D7E Track-Type Tractors".

    Note: Align manifold (5) with nitrogen port pointing toward the plug side of cylinder (1), shown in Illustration 7.



    Illustration 17g03483261

  20. Install valve (4) into manifold (5).


    Illustration 18g03507666

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

    Dry nitrogen is the only gas approved for use in the accumulator. Charging the accumulator with oxygen gas will cause an explosion. This danger will not happen if nitrogen cylinders with standard CGA (Compressed Gas Association, Inc.) Number 580 connections are used. When you order nitrogen gas, be sure that the cylinders are equipped with CGA No. 580 Connections. Do not use color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders.


  21. Attach Tooling (A) to valve (4). Charge the recoil cylinder with dry nitrogen at 21° C (70° F) to 17719 ± 344 kPa (2570 ± 50 psi). Refer to Testing and Adjusting, "Accumulator (Track Tension) - Test and Charge" for more information.


    Illustration 19g03507683

  22. Install guard (3) and bolts (2) .


    Illustration 20g03501166

  23. Install plug (13) into cylinder (1).

End By:

  1. Install the recoil cylinder and the track adjuster.