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42 EATON 420 Mobile Piston Pump Technical Manual E-PUPI-TM002-E4 November 2014

Fluid Cleanliness

The 420 Series pumps are

rated in anti-wear petroleum

uids with a contamination

level of 21/18/13 per ISO

4066. Operation in uids with

levels more contaminated

than this is not recommend-

ed. Fluids other than petro-

leum, severe service cycles,

or temperature extremes

are cause for adjustment of

these codes. Please contact

your Eaton Representative

for specic duty cycle recom-

mendation.

Eaton 420 Series pumps, as

with any variable displace-

ment piston pumps, will op-

erate with apparent satisfac-

tion in uids up to the rating

specied here. Experience

has shown however, that

pump and hydraulic system

life is not optimized with high

uid contamination levels

(high ISO cleanliness codes).

Proper uid condition is

essential for long and

satisfac tory life of hydraulic

components and systems.

Hydraulic uid must have the

correct balance of cleanli-

ness, materials, and additives

for protection against wear

of components, elevated

viscosity and inclusion of air.

Essential information on the

correct methods for treating

hydraulic uid is included

in Eaton publication 561 –

“Eaton Guide to Systemic

Contamination Control”

– available from your local

Eaton distributor. In this pub-

lication, ltration and cleanli-

ness levels for extending the

life of axial piston pumps and

other system components

are listed. Included is an

excellent discussion of the

selection of products needed

to control uid condition.

Installation

and Start-up

Warning: Care should be

taken that mechanical and

hydraulic resonances are

avoided in the application of

the pump. Such resonances

can seriously compromise

the life and/or safe operation

of the pump.

Drive Data

Mounting attitude should be

horizontal using the appro-

priate case drain ports to

ensure that the case remains

full of uid at all times.

Consult your local Eaton

Representative if a different

arrangement is required.

In those cases where geo-

metric tolerances of mount-

ing are critical, or where

specic tolerance ranges are

required and not specied,

consult Eaton Engineering for

specic limits.

Direction of shaft rotation,

viewed from the prime mov-

er end, must be as indicated

in the model designation on

the pump – either right hand

(clockwise) or left hand

(counterclockwise).

Direct coaxial drive through

a exible coupling is recom-

mended. If drives imposing

radial shaft loads are con-

sidered, please consult your

Eaton Representative.

Start-up Procedure

Make sure the reservoir and

circuit are clean and free of

dirt/debris prior to lling with

hydraulic uid.

Fill the reservoir with ltered

oil and ll to a level sufcient

enough to prevent vortexing

at the suction connection to

pump inlet. It is good practice

to clean the system by ush-

ing and ltering, using an

external slave pump.

Caution: Before the pump is

started, ll the case through

the uppermost drain port

with hydraulic uid of the

type to be used. The case

drain line must be connected

directly to the reservoir

and must terminate below

the oil level.

Once the pump is started,

it should prime within a few

seconds. If the pump does

not prime, check to make

sure that there are no restric-

tions between the reservoir

and the inlet to the pump,

and that the pump is being

rotated in the proper direc-

tion, and that there are no air

leaks in the inlet line and con-

nections. Also check to make

sure that trapped air can

escape at the pump outlet.

After the pump is primed,

tighten the loose outlet con-

nections, then operate for

ve to ten minutes (unload-

ed) to remove all trapped air

from the circuit.

If the reservoir has a sight

gage, make sure the uid is

clear – not milky.

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