PUMP GP-PISTON 3137241 - Caterpillar

Assembly Procedure
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     1P-1857     Retaining Ring Pliers     1    
B     1U-6683     Ring Expander     1    
C     1P-0510     Driver Group     1    
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00535407
Piston and Connecting Rod Assembly
Illustration 2 g00535406
If necessary, use Tool (C) and a suitable press to install piston pin bearing (8) into connecting rod (3) .Note: Align the oil holes in the piston pin bearing and the connecting rod when the piston pin bearing is installed.Note: If the clearance between piston pin (2) and piston pin bearing (8) is over 0.080 mm (.0031 inch), replace the piston pin or the piston pin bearing with a new part.
Clean the piston ring grooves of the used pistons with an acceptable tool or 1U-8811 Cleaner. Clean excess carbon from piston (4) .
Illustration 3 g00535802
Install connecting rod (3) into piston (4). Ensure that the identification marks on the connecting rod are on the same side as the marks on the top of the piston.
Lubricate piston pin (2) with clean engine oil and install piston pin (2) through the piston and connecting rod. Use Tool (A) to install two retaining rings (1) on the end of piston pin (2). Locate the ends of retaining rings (1) toward the bottom of piston (4) .Note: Ensure that the piston pin turns freely in the piston pin bearing.
Illustration 4 g00535400
Illustration 5 g00535398
Install the oil control piston ring on the piston with Tool (B) .Note: The ends of spring (9) of the oil control piston ring should be assembled 180 degrees from the oil ring end gap.Note: Each piston ring (5) should be installed with the side marked "R or RN" (10) toward the top of the piston.
Use Tool (B) to install the intermediate piston ring onto the piston.
Illustration 6 g00837554
Use Tool (B) to install the top piston ring onto the piston.Note: The gaps in the intermediate piston ring and the top piston ring should be separated by 120 degrees.Note: Check the clearance of the piston ring end gap for all the rings. Refer to the Specifications Module, "Pistons and Rings".End By: Install the pistons and connecting rods. Refer to Disassembly and Assembly, "Pistons and Connecting Rods - Install".