PUMP GP-PISTON 2518030 - Caterpillar

Image1.4.1
3. Lubricate O-ring seal (6) and install O-ring seal (6) into the shaft groove by hand.
4. Lubricate Teflon seal ring (5) using transmission differential oil as specified in the Operation and Maintenance Manual for your machine.
5. Install Teflon seal ring (5) into the groove 50% of the way around the shaft by hand. Finish the installation into the seal groove using the proper straight, smooth tipped installation tool seal pick (AA).
Refer to Illustration 1.5.1.
Note: Do not overstretch Teflon seal ring (5).
Image1.5.1
6. Carefully install the pick between Teflon seal ring (5) and the shaft. Gently guide the pick around the shaft to engage Teflon seal ring (5) properly into the groove as shown above.
7. Apply pressure with thumb around the shaft groove. This procedure ensures that Teflon seal ring (5) is properly seated with no rolling or flaring of Teflon seal ring (5).
8. Lubricate the seal groove and piston with transmission/differential oil as specified in the Operation and Maintenance Manual for your machine.
9. Install O-ring seal (3) in the seal groove by hand.
10. Lubricate Teflon seal ring (4) using transmission/differential oil as specified in the Operation and Maintenance Manual for your machine.
Image1.6.1
11. Place the 426-2786 Seal Installation Tool (BB) on the top of the piston making sure it is seated. This is mandatory that the dealer uses this 426-2786 Installation Tool to install the Teflon seals, in order to minimize the stretch and reduce chances of scratching/cutting, marring of the teflon seals during installation.
Image1.7.1
12. Install the seal ring onto the seal installation tool, then cupping your hands around the guide, slide the seal down the guide until the seal slips into the ring groove.
Refer to Illustration 1.7.1 for proper hand placement.
Image1.8.1
13. Remove the seal installation tool and Spin the piston several times while applying pressure with thumb to Teflon seal ring (4). This procedure ensures a proper seat with no rolling or flaring of the Teflon seal ring.
Image1.9.1
Image1.9.2
14. Visually inspect Teflon seal ring (4) to ensure that Teflon seal ring (4) is seated squarely in the groove of the piston. Refer to Illustration 1.9.1. If the seal is canted in the groove, as shown in Illustration 1.9.2, the seal may be damaged during installation into the cylinder. Repeat Teflon seal ring assembly procedure until the Teflon seal ring is squarely seated.
15. Apply transmission/differential oil as specified in the Operation and Maintenance Manual to the following:
- Shaft-side piston pocket OD
- Shaft seal and lands ID
- The piston
16. Lower the piston into the cylinder using your hands only.
Image1.10.1
17. Seat the piston into the bottom of the cylinder by pressing indicated-areas. Press the three areas in a circular continuous (B), (C) and (D) three point pattern. Perform this action until the piston is fully seated.
18. After completing the assembly of the shaft, use a soft tipped blow gun to pressure test the assembly. Apply air pressure of less than 150 PSI to the clutch pressure ports on the end of the shaft.
19. If leakage is detected, disassemble the clutch, remove the piston,