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EATON 350 Series Dual Path Mobile Pumps E-PUPI-TS006-E September 2007
Assembly
Servo Piston
Assembly
Step 1
Hold a servo piston bolt (item 4)
head end down, on a work
surface.
Step 2
Slide a spring retaining washer
(item 2) onto the servo piston
bolt so that the stamped word
“IN” faces up, toward where
the spring will go.
Step 3
Slide the spring (item 6) and
springstop over the bolt so that
both parts rest on the spring
retaining washer.
Note: If assembling a HRC
controlled pump, a second
spring will be installed in place
of the displacement limiter.
Step 4
Place the second spring retaining
washer (item 2) over the servo
piston bolt, with the stamped
word “IN” facing the spring.
Step 5
Thread a spring compression
nut (item 7) onto the servo
piston bolt, with the inside
counterbored (smooth) end
facing the spring. Tighten the
spring compression nut until
it is snug against the spring
retaining washer.
Step 6
Insert the servo piston bolt
assembly into the piston (item 1),
threaded end first.
Step 7
Thread a piston plug (item 3) into
the open end of the servo piston.
Step 8
Using a vise and two pieces
of shim stock, grip the piston by
the recessed groove. Do not
mar the rounded surfaces of
the servo piston.
Step 9
Tighten the piston plug (item 3)
to 71±3 n/m (52.4±2.2 lb-ft).
31526784
1 5989957-001 1 Servo Piston
2 5989955-001 2 Spring Retainer
3 4999972-001 1 Plug, Servo Piston
4 5989956-001 1 Servo Piston Bolt
5 5989958-001 1 Spring Stop
5989954-001
6 5989952-001 1 Spring
7 72400-542 1 Nut, Hex
8 16024-6 1 Thin Finished Hex Nut, UNF
REF PART NO. QTY. DESCRIPTION