5
EATON CORPORATION Fluid Power
Test Procedure to Evaluate Fluids in Piston Pumps Technical Data V-PUPI-TS022-E March 2009
Figure 6
Figure 5
Disassembly and
Inspection
(continued)
Inspect its components as
follows:
1 Valve plate running-face –
inspect surface finish visually
and take a photograph.
(Figure 5)
2 Cylinder barrel running face –
inspect surface finish visually.
(Figure 5)
3 Swashplate (yoke) running
face – inspect surface finish
visually. (Figure 5)
4 Swashplate (yoke) bearing
journals – inspect visually.
(Figure 5)
5 Cradle (saddle) bearings –
inspect visually. (Figure 5)
6 Bias and control piston/rod –
inspect visually. (Figure 6)
7 Hold-down arms and shoe
face – inspect visually.
8 Shaft and shaft bearings –
inspect visually. (Figure 6)
9 Measure metering lands’
diameters and widths on
both control spools (compen-
sator). (Figure 6)
10 Measure shoe thickness (B),
pocket depth (A), piston/
shoe endplay (maximum
allowable end play 0.13mm
[0.005”]), piston diameter at
top, middle, and bottom of
piston and cylinder barrel
bores at top, middle, and
bottom. Record results on
the blank Piston/Bore Record
(page 14).
11 Shoe cage – inspect visually.
12 Shaft seal and mating shaft
surface – inspect visually.
13 Photograph visually worn
parts.
