Moog 62 Series Owner's manual

1. INTRODUCTION
This manual provides instructions and procedures necessary
to install, operate and troubleshoot the Moog Series 62 Electrohydraulic
Industrial Servovalve. Troubleshooting instructions are outlined to permit the
identification of the specific component(s) suspected of failure.
2. OPERATION
The Moog Series 62 Electrohydraulic Servovalve consists of an electrical
torque motor, a nozzle-flapper pilot stage and a sliding spool main stage (see
Figure 1). The torque motor includes coils, polepieces, magnets and an armature.
The armature is supported for limited movement by a flexure tube. The flexure
tube also provides a seal between the hydraulic and electromagnetic portions of
the valve.
The flapper attaches to the center of the armature and extends down,
inside the flexure tube. A nozzle is located on each side of the flapper so that
the flapper motion varies the nozzle openings. Pressurized hydraulic fluid is
supplied to each nozzle through a filter and inlet orifice. Differential pressures
caused by flapper movement between the nozzle are applied to the ends of the
valve spool.
The 4-way valve spool controls flow from the supply to either control
port (A or B). The bushing contains flow control ports that are uncovered
by spool motion. A feedback wire is deflected by spool movement so that
feedback torque is applied to armature/flapper.
Electrical current in the torque motor coils causes either clockwise or
counterclockwise torque on the armature. This torque displaces the flapper
between the two nozzles. The differential nozzle pressure moves the spool to
either the right or left. The spool continues to move until the the feedback
torque counteracts the electromagnetic torque. At this point the armature
flapper is returned to the center, so the spool stops and remains displaced until
the electrical input changes to a new level. The actual flow from the valve to
the load will depend upon the load pressure.
62 Series Installation and
Operation Instruction
Electrohydraulic Servovalve
ELECTROHYDRAULIC VALVE CUT-AWAY
CAUTION
DISASSEMBLY, MAINTENANCE, OR REPAIR OTHER THAN IN ACCORDANCE WITH THE
INSTRUCTIONS HEREIN OR OTHER SPECIFIC WRITTEN DIRECTIONS FROM MOOG WILL
INVALIDATE MOOG’S OBLIGATIONS UNDER ITS WARRANTY.
Plug
Electrical
Connector
Flapper
Torque
Motor Coil
Upper Polepiece
Armature
Flexure Sleeve
Nozzle
Feedback Wire
Spool
Inlet Orifice
Filter Tube
Figure 1 Moog Series 62
P A R B

3. HYDRAULIC SYSTEM PREPARATION
To prolong servovalve operational life and to reduce hydraulic system
maintenance, it is recommended that the hydraulic fluid be kept at a cleanliness
level of ISO Code 16/13 (NAS Class 5) or better. The most effective filtration
scheme incorporates the use of kidney loop or “off-line” filtration scheme with
ß3≥75 filters for maximimum effectiveness.
Upon system start-up, the hydraulic system should be purged of built in
contamination particles by an adequate flushing of the entire hydraulic circuit
prior to mounting the servovalves. The servovalve should be replaced with
a flushing manifold and the hydraulic circuit powered up under conditions of
fluid temperature and fluid velocity which reasonably simulate normal operating
conditions. New system filters are installed during the flushing process
whenever the pressure drop across the filter element becomes excessive. The
flushing process should turn the fluid in the reservoir over between fifty to one
hundred times.
To maintain a clean hydraulic system, the filters must be replaced on
a periodic basis. It is best to monitor the pressure drop across the filter
assembly and replace the filter element when the pressure drop becomes
excessive. In addition to other filters that are installed in the hydraulic circuit,
it is recommended that a large capacity, low pressure ß3≥75 filter be installed
in the return line. This filter will increase the interval between filter element
replacement and greatly reduce the system contamination level.
4. INSTALLATION
The Moog 62 Series Industrial Servovalve may be mounted in any position,
provided the servovalve pressure, control and return ports match respective
manifold ports. The mounting pattern and port location of the servovalve are
shown on Page 4. The servovalve should be mounted with 5/16-18 x 1 inch long
socket head capscrews and lockwashers. Torque the screws to 96 inch-pounds.
Wire the mating electrical connector for desired coil configuration and
polarity (see 62 Series Servovalve catalog, CDL6267). Thread connector to
valve.
5. MECHANICAL NULL ADJUSTMENT
It may be desirable to adjust the servovalve for flow null independent
of the other system parameters. The mechanical null adjustment permits
convenient control function set-ups. The “mechanical null adjustor” is a hex
socket set screw located behind the the pan head screw in the motor cap (see
Figure 2) which, when adjusted, provides control of the spool position to obtain
desired flow null.
NORMAL ADJUSTMENT SHOULD REQUIRE LESS THAN ± ONE TURN.
LIMIT NULL SCREW ADJUSTMENT TO LESS THAN ± TWO TURNS.
Adjustment Procedure
a. Ensure that zero electrical signal is applied to servovalve by disconnecting
electrical power to servovalve.
b. Using a blade screwdriver, remove pan head screw to permit
adjustment of hex socket set screw.
c. Using a 21/2inch long, 1/8 inch Allen wrench, adjust set screw to obtain
desired flow null.
NORMAL ADJUSTMENT SHOULD REQUIRE LESS THAN ± ONE TURN.
Note:
Clockwise orientation of set screw produces flow out control port B
d. After desired flow null has been obtained, install pan head screw.
e. Connect electrical power to servovalve.
Tools and Equipment
a. Blade screwdriver
b.
3/16 inch Allen wrench
c. Tweezers
d.
1/8 inch Allen wrench
e.
7/16 inch socket
6. GENERAL SERVICING RECOMMENDATIONS
a. Disconnect electrical lead to servovalve.
b. Relieve hydraulic system of residual pressure.
c. Remove servovalve.
Figure 2
Mechanical Null Adjustment
Table 1. Replacement Parts
Part Description Qty. Part Number
62 Series Filter Replacement Kit 1 B52555RK206K001
Inlet Orifice O-Ring (1) 2 -42082-012
Seal Plate (I) 2 CA86799-001
Base O-Ring 4 -42082-022
62 Series Orifice Filter Assembly (1) 2 A25446-001
(1) Included in 62 Series Filter Replacement Kit.
2 Moog•62SeriesOperationInstruction•RevE11/21

Potential Trouble
Servovalve does not respond to
command signal.
Output flow obtained from one control port
only. (Actuator is at limit of stroke or hydraulic
motor is rapidly rotating.)
Limited or no response to
command signal.
High null bias (actuator drifts or hydraulic
motor slowly rotates when controller returns
to neutral).
Poor response (valve delays in returning to
neutral each time controller is returned to
neutral).
Non-repeatability (valve fails to return to neutral
each time controller is returned to neutral).
Probable Cause
1. Controller does not function.
2. Open controller cable.
3. Open coil or open coil lead.
4. Jammed spool.
1. Controller not functioning properly.
2. Filters silted with contamination.
3. Null adjustor adjusted hardover.
1. Incorrect null adjustment.
2. Filters silted with contamination.
Filters silted with contamination.
Controller not functioning properly.
Remedy
1. Replace controller.
2. Replace controller cable.
3. Factory repair.
4. Factory repair.
1. Replace controller
2. Replace inlet orifice filter assemblies (Figure 3).
3. Readjust null.
1. Readjust null.
2. Replace inlet orifice filter assemblies (Figure 3).
Replace inlet orifice filter assemblies (Figure 3).
Replace controller.
7. TROUBLESHOOTING CHART
The following troubleshooting chart list potential troubles encountered, probable causes, and remedies.
8. FILTER ASSEMBLY REPLACEMENT (one each end of body)
a. Using a 3/16 inch Allen wrench or 7/16 inch socket, remove the three socket
head cap screws (or bolts) and lockwashers from end plate. Remove
end plate.
b. Remove seal plate and O-Ring.
c. Locate inlet orifice/filter assembly. Do not touch or attempt to remove
bushing spool assembly (see Figure 3).
d. Insert edge of blade screwdriver under lip of inlet orifice/filter and remove
inlet orifice/filter assembly and associated O-Ring from body.
e. Visually inspect inlet orifice/filter assembly for damage or foreign matter.
(Unless they are new, inlet orifice/filter assemblies should be discarded
and replaced each time they are removed).
f. Inspect and replace O-Ring as required.
g. Place seal plate on a flat clean surface. Install O-Ring in seal plate. Because
O-Ring is slightly larger than seal plate, it will be necessary for assembler
to “lead” O-Ring into seal plate with a finger.
h. Install seal plate containing O-Ring. Install end plate on servovalve body.
Install socket head cap screws or bolts and lockwasher. Torque screws to
85 inch pounds.
i. Repeat steps a. through h. for opposite end of servovalve.
9. AUTHORIZED REPAIR FACILITIES
Moog does not authorize any facilities other than Moog or Moog
subsidiaries to repair its servovalves. It is recommended you contact Moog at
[phone] or visit www.moog.com/industrial to locate your closest Moog
repair facility. Repair by an independent (unauthorized) repair house will result
in voiding the Moog warranty and could lead to performance degradation or
safety problems. Moog•62SeriesOperationInstruction•RevE11/21 3
Seal Plate
Inlet Orifice/Filter
Assembly
(one each end of body)
End
Plate
Bushing Spool
Assembly
Seal Plate O-Ring
Figure 3

62 SERIES INSTALLATION AND OPERATION INSTRUCTION NOTES
TYPICAL WIRING SCHEMATIC
The products described herein are subject to change at any time without notice, including, but not limited to, product features, specifications, and designs.
1 Fluid:
Industrial type petroleum base hydraulic
fluid, maintained to ISO DIS 4406 Code
14/11 recommended.
2 Operating Temperature
Range:
0˚Fto200˚F(-18˚Cto93˚C)
3 Valve Phasing:
Flow out port B results when Series
coils: B & C connected, A+, D-
4 Surface:
Surface to which valve is mounted
requires finish, flat within .002 [0.05] TIR.
5 Null Adjust:
Flow out port B results with clockwise
rotation of null adjust set screw
(1/8hex key).
3
A B C D
Right
Hand
Left
Hand
Green
White
Black
Red
A
B
C
D
Moog Inc., East Aurora, NY 14052-0018
Telephone: [phone]
Fax: [phone]
Toll Free: +1-800-272-MOOG
www.moog.com/industrial
©2021 Moog Inc. All changes are reserved.
CDS6386 RevE 500-289 1121
TJWhite Moog is a registered trademark of Moog Inc. and its subsidiaries. Unless expressly indicated, all trademarks as indicated herein are the property of Moog Inc. and its subsidiaries. For disclaimers, see www.moog.com/literature/disclaimers.
4 Moog•62SeriesOperationInstruction•RevE11/21
M
CONTROL PORT B
PRESSURE PORT P
3.88
1.94
CBORE .50 DIA x .63 DP
4 MOUNTING HOLES
.014
2.562
1.281
.875 .437
1.750 .390
3.500
1.500
.500
3.000
CONTROL PORT A
.437
.875
.875
1.750
4 ALE MTG HOLES
.007
4 PLACES
.312 DIA
.014
.136 DIA  .20 DEEP
.015
ALE MOUNTS ON THIS
MANIOLD SURACE
1
1.00
4 PL
PORT PER SAE 1926
1.062512 UN2B
DASH 12 STR THD ORING
BOSS .75 TUBE OD RE
4 PLACES
.0015
63
2.00
P
2.11
4.22
RETURN PORT T
.344 DIA THRU
.312518 UNC2B THD
M
M
M
1.60 MAX
[40.62]
3.20 MAX
[81.28]
1.75 [44.45]
.86 [22.22]
1.281
[32.55]
2.562
[65.07]
MANUAL OVERRIDE LEVER
IF SO EQUIPPED
8
4x Ø 34 [8.64] THRU
Ø 53 [13.46] TO DEPTH SHOWN
IN RIGHT-HAND END VIEW
ELECTRICAL CONNECTOR MATES
WITH MS 3106-14S-2S
SHOWN OVER CONTROL PORT [B]
(ALTERNATE CONSTRUCTION
OVER CONTROL PORT 1 [A] )
>
1.86 [47.21] MAX 4.77 [121.04] MAX
2.95 [74.90]
4.57 MAX
[115.97]
2.80
[71.11]
3.76
[95.41]
.48 MAX
[12.06]
.44
[11.30]
TYP
.87 [22.21]
.87 [22.21]
.44 [11.11]
.44 [11.11]
4
4
4
4
RETURN PORT
4.75 [120.63] MAX
2.37 MAX [60.31]
CONTROL PORT NO. 2 [B]
PRESSURE PORT
CONTROL PORT NO. 1 [A]
A B C D
INTRINSICALLY SAFE
SCHEMATIC 3
A B C D
4