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Main Control Valve, Specifications: Service Information

This document provides specifications for the main control valve on an EC290B LC Volvo excavator. It lists the model, type, functions, components, and standard, rebuild, and service limit pressure values for the main relief valve, boom port relief valve, arm port relief valve, bucket port relief valve, flow sensing valve, slew motor crossover relief valve, track motor relief valve, and servo hydraulic pump relief valve. It notes that pressures can vary from standard values due to factors like back pressure, piping pressure drops, flow rates, oil temperature, and measurement tools.

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Ko Zay
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227 views2 pages

Main Control Valve, Specifications: Service Information

This document provides specifications for the main control valve on an EC290B LC Volvo excavator. It lists the model, type, functions, components, and standard, rebuild, and service limit pressure values for the main relief valve, boom port relief valve, arm port relief valve, bucket port relief valve, flow sensing valve, slew motor crossover relief valve, track motor relief valve, and servo hydraulic pump relief valve. It notes that pressures can vary from standard values due to factors like back pressure, piping pressure drops, flow rates, oil temperature, and measurement tools.

Uploaded by

Ko Zay
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Service Information

Document Title: Function Group: Information Type: Date:


Main control valve, 030 Service Information 10/26/2016
specifications
Profile:
EC290B LC Volvo

Main control valve, specifications


Specifications

Item Unit Specifications


Model SS32
Type – 7 Spool mono block servo hydraulic operated
Function – • Boom, arm regeneration
• Prevention for boom, arm drift
• Boom priority
• Slew priority
• Straight travel

Specifications

Components Mode Standard/Rebuild value, unit : MPa Service limit value, unit : MPa (kgf/
(kgf/cm2) (psi) (bar) cm2) (psi) (bar)
Main Main relief valve Standard 32.4 +1.5/-1 (330 +15/-10) (4693 32.4 +1.5/-2 (330 +15/-20) (4693
control +213/-142) (324 +14.7/-9.8) +213/-284) (324 +14.7/-19.6)
valve at 220 l/min (58.1 US gal/min) at 220 l/min (58.1 US gal/min)
Boost 34.3 +1.5/-1 (350 +15/-10) (4978 34.3 +1.5/-2 (350 +15/-20) (4978
+213/-142) (343 +14.7/-9.8) +213/-284) (343 +14.7/-19.6)
at 190 l/min (50.2 US gal/min) at 190 l/min (50.2 US gal/min)
Boom port relief Raise 35.8 +1.5/-1 (365 +15/-10) (5192 35.8 +1.5/-2 (365 +15/-20) (5192
valve Lower, +213/-142) (358 +14.7/-9.8) +213/-284) (358 +14.7/-19.6)
at 30 l/min (7.9 US gal/min) at 30 l/min (7.9 US gal/min)
Arm port relief In 35.8 +1.5/-1 (365 +15/-10) (5192 35.8 +1.5/-2 (365 +15/-20) (5192
valve Out +213/-142) (358 +14.7/-9.8) +213/-284) (358 +14.7/-19.6)
at 30 l/min (7.9 US gal/min) at 30 l/min (7.9 US gal/min)
Bucket port relief Curl 35.8 +1.5/-1 (365 +15/-10) (5192 35.8 +1.5/-2 (365 +15/-20) (5192
valve Dump +213/-142) (358 +14.7/-9.8) +213/-284) (358 +14.7/-19.6)
at 30 l/min (7.9 US gal/min) at 30 l/min (7.9 US gal/min)
Option - 2 stage (AL2) Low 20.6 +0.5/0 (210 +5/0) —
relief valve (2987 +71/0) (206 +5/0)
at 250 l/min (66.1 US gal/
min)
High 35.8 +1.5/-1 (365 +15/-10) 35.8 +1.5/-2 (365 +15/-20) (5192
(5192 +213/-142) (358 +213/-284) (358 +14.7/-19.6)
+14.7/-9.8) at 30 l/min (7.9 US gal/min)
at 30 l/min (7.9 US gal/
min)
(BL2) 35.8 +1.5/-1 (365 +15/-10) (5192 35.8 +1.5/-2 (365 +15/-20) (5192
+213/-142) (358 +14.7/-9.8) +213/-284) (358 +14.7/-19.6)
at 30 l/min (7.9 US gal/min) at 30 l/min (7.9 US gal/min)
Flow sensing valve pressure 3.04 ±0.1 (31 ±1) (441 ±14) (30 ±1)
at 32 lpm (8.5 U.S.gpm)
3.4 +0.5/0 (35 +5/0 (498 +71/0) (34.3
+4.9/0)
at 45 lpm (11.9 U.S.gpm)
Slew motor crossover relief Left 26.5 +2.5/0 (270 +25/0) (3839 +356/0) 26.5 +2.5/-1 (270 +25/-10) (3839
valve Right (265 +25/0) +356/-142) (265 +25/-9.8)
at 200 l/min (52.8 US gal/min) at 200 l/min (52.8 US gal/min)
Track motor relief valve Left 36.3 +1.5/-1 (370 +15/-10) (5261 36.3 +1.5/-2.5 (370 +15/-10) (5261
Right +213/-142) (363 +15/-10) +213/-356) (363 +15/-25)
at 30 l/min (7.9 US gal/min) at 30 l/min (7.9 US gal/min)
Servo hydraulic pump relief valve pressure 3.9 +0.2/0(40 +2/0) (569 +29/0) (39
+2/0)

1. “Standard value” is the pressure value which is set in a new machine in the factory.
2. “Rebuild value” is the target pressure value which should be secured in a machine when hydraulic components are
rebuilt or remanufactured.
3. “Service limit value” is the pressure value required to obtain at least the proper basic machine performance level.
Component inspection for wear or failure, and/or pressure adjustment, should be carried out when the measured
pressure value does not meet the “Service limit value tolerances”.
4. Main and port relief pressures are easily influenced by the factors below in number 5, therefore pressure measuring
condition should be strictly kept and pressure should not be adjusted unnecessarily when a measured pressure on a
machine in the field, is within the tolerance range in the above table.
5. Main and port relief pressures which are measured in a field machine could be different from the values that are
measured in the bench tool because of the following reasons,

¡ back pressure (especially in swing relief pressure)


¡ pressure drop in the piping work (especially in travel relief pressure)
¡ flow rate and hydraulic oil temperature
¡ measuring tools (gauge error, etc)

NOTE!
Do not set pressures at the upper limit of Service Limit Tolerance.

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