CUSHION AS-SEAT 4V8271 - Caterpillar

Place the port plate (6) on the surface plate. The flat side of the port plate (6) must be facing downward.
Install the alignment plug (10) into the port plate center bore. The chamfer side of alignment plug (10) must be facing upward.
Place the barrel (5) on the port plate and the alignment plug.
Place the test ring (8) or test pins (8) on the barrel in place of springs.Note: The 190cc and 260cc pumps require the use of three test pins in place of the test ring. Place the three test pins around the outside diameter of the center pin bore of the barrel. The three test pins must be equally spaced around the center pin bore of the barrel.
Install the ball joint (2) over the test ring pins on the barrel.
Place the piston retaining plate (1) over the ball joint.
Bolt tool (7) and tool (9) together. Place the tool (7) and the tool (9) on the barrel. Refer to Illustration 42.
Measure dimension (A) by measuring the distance from the surface plate to the top of the measuring bell.
Dimension (B) is scribed on the tool (7).
Measured dimension (A) minus dimension (B) yields dimension (C).dimension (A) - dimension (B) = dimension (C)Note: Do not measure the distance from the surface plate to the top of the piston retaining plate in place of dimension (C). The piston retaining plate may not be square with the surface plate, and the measurement will not be accurate.
Take the required lift-off clearance (D) from Table 40 minus the calculated dimension (C) to find the required thickness of the shim (3).dimension (D) - dimension (C) = required shim thickness.
Table 40
Lift-Off Clearance
Displacement in cc Dimension (D) in mm (in)
95 122.45-122.65 (4.8208-4.8287)
130 136.75-136.95 (5.3839-5.3917)
145 136.75-136.95 (5.3839-5.3917)
190 146.1-145.85 (5.75195-5.7421)
200 149.30-149.50 (5.8780-5.8858)
250 160.75-160.95 (6.3287-6.3366)
260 170.95-171.20 (6.7303-6.7402)
Select appropriate shim (3) from Table 41.Note: 130cc and 145cc pumps use one shim and one additional shim if needed for adjustment of lift-off clearance. This is shown in Table 39.Note: 190cc, 200cc, 150cc and 260cc pumps use the appropriate shims as shown in Table 41 to meet measurement (C) in Step 12.
Table 41
Adjustment Shim (3)
Displacement in cc Shim thickness is mm (in) Part Number
95 0.70 (0.0276) 130–7808
0.90 (0.0354) 130–7809
1.10 (0.0433) 130–7807
1.30 (0.0512) 130–7810
130 0.70 (0.0276) 6E-0723
0.90 (0.0354) 6E-0721
1.10 ((0.0433) 6E-0720
1.30 (0.0512) 6E-0722
1.50 (0.0591) 6E-0724
145 0.70 (0.0276) 6E-0723
0.90 (0.0354) 6E-0721
1.10 ((0.0433) 6E-0720
1.30 (0.0512) 6E-0722
1.50 (0.0591) 6E-0724
190 0.50 (0.0197) 179-6915
0.075 (0295) 179-6914
200 0.60 (0.0236) 5I-4271
0.08 (0.0315) 5I-4270
1.00 (0.0394) 5I-4269
1.20 (0.0472) 5I-4268
250 0.60 (0.0236) 6E-3844
0.08 (0.0315) 6E-3843
1.00 (0.0394) 6E-3842
1.20 (0.0472) 6E-3841
260 0.50 (0.0197) 165-9361
0.75 (0.0295) 165-9362
Remove the tooling and install the appropriate shim between the barrel and the spring group.A20VLO
Note: The A20VLO adjustment of the rotary group procedure for the bearing preload and the lift-off clearance adjustment uses the same procedure as the A11VO/A11VLO.Note: Perform calibration for each rotary group.