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2

Forward

This manual illustrates and describes the recommended pro-
cedure for servicing the CM2 and CM3 series valves.

Valves of the -30 design will be referred to throughout this
manual, but this information is essentially the same for the -20
design valves. Service parts are generally interchangeable be-
tween the -20 and -30 design valves, however, it is recom-
mended that the catalogs referenced in Table I be consulted for
service parts for the respective design. Customers who wish to
incorporate -30 design sections in -20 design valves can do so
without concern. In this instance, a tie bolt must be left out. This
does not affect the operation or function of the valve as one tie
bolt on the -20 design is redundant.

To service these valves, read this manual thoroughly, and fol-
low the instructions carefully.

Comments or suggestions concerning this publication may be
direct to the Mobile Service Department of Vickers.

E

Eaton Hydraulics, Incorporated 2000

All Rights Reserved

Summary of Contents for Vickers CM2 Series

Page 1: ...M 2400 S Revised 7 1 86 Multiple Unit Valves CM2 and CM3 Series 20 Design CM2 and CM3 Series 30 Design Overhaul Manual Vickers Directional Controls...

Page 2: ...ferenced in Table I be consulted for service parts for the respective design Customers who wish to incorporate 30 design sections in 20 design valves can do so without concern In this instance a tie b...

Page 3: ...6 Detent 9 7 Tandem Operation 10 C Non Operating Sections 10 1 General 10 IV Installation 11 A Installation Drawings 11 B Mounting 11 C Port Connections 11 D Relief Valve 11 E Tandem Installation 11 F...

Page 4: ...mensions are not contained in this manual The parts catalogs and installation drawings listed in Table 1 are available from your local Vickers Mobile Division application engineering office or from Vi...

Page 5: ...ions Table 2 Model Code Breakdown 4 Port Connections CM2 Series 1 1 3 16 12 inlet cyl ports 1 5 16 12 outlet ports 2 1 5 16 12 inlet cyl ports 1 5 8 12 outlet ports 4 1 5 8 12 inlet outlet ports 1 5 1...

Page 6: ...and a check valve The inlet section also contains a relief valve assembly Passages between the bodies connect each section to the common inlet and tank ports Seal rings between the sections seal the...

Page 7: ...has two pressure connections One connection is made to the pump source and the second connection is made with a preceding valve assembly to accept the by pass flow for tandem operation The F section l...

Page 8: ...he end of the cylinder not under pressure has its return flow directed to tank via internal coring of the valve sections See Figure 5 for spool position versus flow D Double Acting Spool B A P T MAN M...

Page 9: ...s the opposite end The valve is thus hydrau lically balanced and the large spring holds it closed Figure 6 Neutral Out Pressure Tank Return Flow A T spool in OUT position Pressure to B port A port blo...

Page 10: ...second bank Otherwise reduced flow will be encountered C Non Operating Sections 1 General The CM2 valve non operating sections are the E and L outlet sections and a center U section These sections do...

Page 11: ...s are nec essary for proper installation should be used G Hydraulic Fluid Recommendations The oil in a hydraulic system serves as the power transmission medium It is also the system s lubricant and co...

Page 12: ...oil should not be less than 90 Multiple viscosity oils such as SAE 10W 30 incorporate additives to improve viscosity index polymer thickened Oils of this type generally exhibit both temporary and per...

Page 13: ...reign particles If excessive contamination is found the system should be drained The reservoir must be cleaned thoroughly before refilling C Adding Fluid to the System When hydraulic fluid is added to...

Page 14: ...detent barrel Weak or broken detent spring Replace detent barrel Replace detent spring No motion slow or jerky action of hydraulic system Relief valve not properly set or stuck in base and or worn Di...

Page 15: ...akage the surfaces can be stoned or polished with crocus cloth If scoring is excessive the valve body and spool must be replaced by ordering a new section Check the valve spool for freedom of movement...

Page 16: ...function when the spool is in neutral and oper ating position 2 Anti Cavitation Check with Cylinder Port Relief Valve The anti cavitation check with cylinder port relief valve is a combination of ant...

Page 17: ...ainer 2 req d Spring Guide Cap Screw 2 Req d Screw Body and spool not availabel separately Order valve seciton by model number Ring Ring 4 req d Plug O Ring Spring Control Valve Sub Assy Plug Not used...

Page 18: ...tion Detent used on I Section F Inlet Section U Section L Section Plug Spring Piston Cap Screw Screw 2 req d Detent Plug O Ring Spring Guide Ball Cap O Ring Spring Cylinder Port Relief Valve Subassemb...

Page 19: ...All rights reserved Printed in U S A Eaton Hydraulics 15151 Highway 5 Eden Prairie MN 55344 Telephone 612 937 7254 Fax 612 937 7130 www eatonhydraulics com 46 New Lane Havant Hampshire PO9 2NB Englan...

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