Danfoss MCV108C Installation guide

DESCRIPTION

The MCV108C Variable Pump Hydraulic Displacement Con­trol is a single stage hydraulic pump stroke control using
mechanical feedback to establish closed loop swashplate
angle control of Danfoss 46 cc medium duty pumps.

The MCV108C uses a differential hydraulic input pressure to
drive its piston and rotary valve arrangement and port oil to
the pump servo cylinders. The rotary spool configuration
allows a null deadband (for machine safety) in the pump's
output while maintaining optimum dynamic response to
control commands.

FEATURES

MCV108C

Hydraulic Displacement Control-PV

BLN-95-8994-3 Issued: August 1999

• Servo control deadband independent of signal null
deadband: offers safety combined with accurate and re­sponsive control.

• Withstands rugged environmental testing.

ORDERING INFORMATION

Order your HDC-PV by choosing the input pressure from the
control source using the information in Table A.

TABLE A. INFORMATION NECESSARY TO SPECIFY
THE HDC-PV.

MCV108C30 XX

STANDARD CASTING

PRESSURE RANGE

MCV108C replaces MCV108A and MCV108B.

• Minimum long term shift.

• Configured to accept most hydraulic input signals.

INPUT PRESSURE RANGE DESCRIPTION

11 19-170 psid nominal

14 44-200 psid nominal

15 70-220 psid nominal

Order MCV108s factory installed on pumps from
Danfoss Ames, Iowa or as a separate component from
Danfoss Minneapolis, Minnesota.

SPARE PARTS

Danfoss provides spare parts for the MCV108C.
See the Spare Parts drawing.

TECHNICAL DATA

OPERATING CHARGE PRESSURE

150-500 PSI above case pressure

OIL VISCOSITY

40-6000 SSU

FILTRATION

The system hydraulics will have a filtration rating of beta
sub 10 = 2 or better.

© Danfoss, 2013-09 BLN-95-8994-3 1

FLUID TEMPERATURE

The valve will be functional and undamaged at oil

temperatures of -40° to 121° C (-40° to 250° F).

The valve will meet performance specifications with a

fluid temperature of 21° to 82° C (70° to 180° F).

FLUID

Automatic transmission fluid or hydraulic oil such as
Mobil DTE 24 or equivalent.

TECHNICAL DATA (continued)

THRESHOLD

19±7 psi/side (38±14 psi total) (Model 01)
44±14 psi/side (88±28 psi total) (Model 04)
70±10 psi/side (140±20 psi total) (Model 05)

RATED MODULATING PRESSURE

170±16 psi (Model 01)
200±20 psi (Model 04)
220±20 psi (Model 05)

SPARE PARTS

SENSITIVITY

A 1% of modulating range change in input delta pressure
will cause a detectable output change.

MAXIMUM HYSTERESIS

25 psi when cycled at .01 Hz

NEUTRAL LEAKAGE

.10 gpm maximum across the valve with oil of 145-160

SUS at 100° F.

ITEM PART

NUMBER NUMBER QTY DESCRIPTION

1 K13340 1 LINK COVER
2 K13341 1 COVER GASKET
3 K07006 2 O-RING (.49 I.D. X .07)
4 9004101-1190 1 O-RING (.93 I.D. X .103)
5 K07057 2 SOC. HD CAP SCREW (1/4-20 X 5/8)
6 K11615 1 HEX NUT (5/16 - 24)
7 K10057 1 SOCKET SET SCREW (5/16 - 24 X .875)
8 K08131 1 NULL ADJUST GASKET

9 K00944 1 NULL ADJUST COVER
10 K09305 4 SOC. HD CAP SCREW (10 - 32 X .31)
11 K08388 1 SEAL WASHER
12 9009625-0163 1 WASHER *
13 K22539 1 SLEEVE WITH SNAP RING

** KK05602 1 MOUNTING HARDWARE BAG ASSY

*** KK05601 1 MOUNTING HARDWARE BAG ASSY

* Purchase from Danfoss Ames, Iowa
** Bag assembly includes items 4, 13 and mounting screws
*** Bag assembly for MCV108A and MCV108B

BLN-95-8994-3

2

1452B

DIMENSIONS

Dimensions of the MCV108 in Millimeters (Inches).

3

1449A

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INTERNAL WORKINGS SCHEMATIC

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1450A

4

BLOCK DIAGRAM

INPUT

SHAFT

SLEEVE

DISPLACEMENT

CONTROL

SERVO

PISTON

SPOOL

CHARGE PUMP

VARIABLE DISPLACEMENT PUMP

RESERVOIR

FILTER

CHARGE

RELIEF

VALVE

RELIEF/CHECK

HEAT EXCHANGER BY PASS

HEAT EXCHANGER

VALVES

BY PASS

VALVE

CYLINDER

BLOCK

ASSEMBLY

FIXED DISPLACEMENT MOTOR

SUCTION FLOW
CHARGE PRESSURE
HIGH PRESSURE
CASE PRESSURE
CONTROL PRESSURE

SWASHPLATE

FIXED

OUTPUT

SHAFT

M46 Pump with Hydraulic Displacement Control.

CUSTOMER SERVICE

NORTH AMERICA

ORDER FROM

Danfoss (US) Company

Customer Service Department
3500 Annapolis Lane North
Minneapolis, Minnesota 55447
Phone: [phone]
Fax: [phone]

DEVICE REPAIR

For devices in need of repair or evaluation, include a
description of the problem and what work you believe
needs to be done, along with your name, address and
telephone number.

RETURN TO

Danfoss (US) Company

Return Goods Department
3500 Annapolis Lane North
Minneapolis, Minnesota 55447

1451A

EUROPE

ORDER FROM

Danfoss (Neumünster) GmbH & Co.
Order Entry Department
Krokamp 35
Postfach 2460
D-24531 Neumünster
Germany
Phone: [phone]
Fax: [phone]

5

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