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Accumulator (Pilot)

The document describes the function of an accumulator in a pilot system, which stores pilot pressure oil for the main control valve. It highlights that the accumulator provides oil when there is inadequate flow from the pumps, particularly during operations where implements are lowered with the engine stopped or during combined operations. The document includes illustrations detailing the components of the accumulator and the flow of pilot oil.

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victor lara
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17 views2 pages

Accumulator (Pilot)

The document describes the function of an accumulator in a pilot system, which stores pilot pressure oil for the main control valve. It highlights that the accumulator provides oil when there is inadequate flow from the pumps, particularly during operations where implements are lowered with the engine stopped or during combined operations. The document includes illustrations detailing the components of the accumulator and the flow of pilot oil.

Uploaded by

victor lara
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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20/4/25, 12:15 SIS 2.

2020/07/13 Accumulator (Pilot) (M0120170-04)

SMCS - 5077 i08162385

PIP
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202 1071
17: 5 / 0 6 781
1 4/ 2
M0 :03- 0
5
1
© 2 2017 05:00
025 0
Cat
erp
illa
Illustration 1
(1) Accumulator
(2) Upper pilot oil manifold
g06573016
rI nc.
The accumulator stores pilot pressure oil for use at the main control valve. During some
operations, the pilot system needs more oil because there is insufficient flow from the pumps.
Accumulator (1) will provide pilot pressure oil to the pilot system when the pilot pump flow is
inadequate. Insufficient supply of pilot oil flow to the pilot system may be caused by the following
two reasons:

Implements are lowered while the engine is stopped and oil supply to the main control valve
is stopped.

Combined operations

https://sis2.cat.com/#/print-preview/service/f0038ab0-c18e-490a-b74e-fc76a7fe9315 1/2
20/4/25, 12:15 SIS 2.0

Illustration 2 g06199181
Accumulator
(1) Accumulator
(2) Upper pilot oil manifold
(3) Gas chamber
(4) Bladder
(5) Pressure oil chamber
(6) Passage
Pilot oil flows through passage (6) of pilot oil manifold (2). Then the oil flows into pressure oil
chamber (5). The pilot oil acts against bladder (4) and the nitrogen gas in gas chamber (3) is
compressed.

PIP-10716781
2025/04/20
17:14:52-05:00
i07021354
© 2025 Caterpillar Inc.

https://sis2.cat.com/#/print-preview/service/f0038ab0-c18e-490a-b74e-fc76a7fe9315 2/2

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