Moog Flo-Tork 900 Technical specifications

Service
FS 105
May 2009
MAINTENANCE INSTRUCTIONS – HYDRAULIC ROTARY ACTUATORS
GENERAL
MOOG FLO-TORK ROTARY ACTUATORS REQUIRE CLEAN, FILTERED
HYDRAULIC OIL FOR SATISFACTORY OPERATION, THE SAME AS
ANY OTHER HYDRAULIC COMPONENT. THE STANDARD BUNA-N
SEALS ARE DESIGNED FOR PETROLEUM BASE FLUIDS. DURING
RE-ASSEMBLY, TORQUE ALL BOLTS IN ACCORDANCE WITH
TORQUE TABLE.
MODELS 900 THROUGH 30,000
MAXIMUM OPERATING PRESSURE: 3000 psi NON-SHOCK
KEY CONSIDERATION IN THE DISASSEMBLY OF THE UNIT IS DETERMINING THE PINION SHAFT
KEYWAY RELATIONSHIP TO THE RACK POSITION TO MAINTAIN PROPER TIMING AT RE-ASSEMBLY.
NOTE: STANDARD UNITS ARE TIMED WITH THE PINION SHAFT KEYWAY AT 12 O’CLOCK
WHEN LOOKING AT THE BEARING CAP SIDE AS SHOWN ON THE ENCLOSED TYPICAL DRAWING.
DISASSEMBLY
1. Remove all cylinder head tie bolts/tie rods.
2. Remove cylinder heads.
3. Determine the rack is at mid-point of travel (equal amounts of rack
extended on each side of housing). Note and record pinion shaft
keyway location for re-assembly.
4. Back o the bearing cap set screw. Using a spanner wrench,
unscrew the threaded bearing cap from the housing.
5. Remove O-ring from housing.
6. Pull pinion from the housing with the bearing on it, placing unit
over a pan or tub as it is lled with gear lubricating oil which will
drain from the housing when the pinion is removed.
7. Remove the cylinder tubes.
8. Remove the piston/rack(s).
9. Remove the back bearing from the housing (if necessary).
10. Remove all remaining O-rings and seals. Replace with new O-rings
and seals at re-assembly.
11. Thoroughly clean and inspect all parts for wear or damage.
Replace with new parts as required. Lubricate with light oil before
re-assembly.
RE-ASSEMBLY
1. Install new O-rings, back-up rings and seals in proper grooves
(see drawing).
2. Install back bearing in housing.
3. Slide a cylinder tube over one end of the piston/rack assembly. If
it is a double rack unit, slide a cylinder tube over one end of the
second piston/rack assembly.
4. Slide piston/rack assembly and cylinder tube into the housing. If it
is a double rack unit, slide both piston/rack assemblies and cylinder
tubes into the same side of the housing.
5. Attach cylinder head(s) and bolts. Snug bolts up but do not torque
until re-assembly is complete.
6. Center rack in housing. (Equal spacing of rack on both sides of
housing.)
7. Install pinion with the shaft keyway location as noted during
disassembly. (Standard unit timing will have keyway at 12 o’clock
location when looking at the front mounting face.)
8. Install cylinder tube(s) on the other side of housing.
9. Attach cylinder head(s) and bolts. Snug bolts up, but do not torque
until re-assembly is complete.
10. Lay unit down and ll housing to top of the rack with ISO grade 68
gear oil or other equivalent gear lubricant.
11. Install front pinion bearing and O-ring.
12. Install bearing cap. Tighten bearing cap until snug, then further
tighten slightly to ensure a positive seal.
13. Insert nylon locking pellet in bearing cap set screw hole. Tighten set
screw locking bearing cap.
14. Torque cylinder head bolts evenly by applying force alternately to
opposite corners of the head. Torque values per bolt size are shown
in the torque table.
Moog Flo-Tork 1701 N. Main St. P.O. Box 68, Orrville, Ohio 44667-0068
PHONE: [phone] FAX: [phone]
900-30,000
MODEL NO. FASTENER SIZE RECOMMENDED TORQUE FOR
CYLINDER HEAD BOLTS
900 & 1800 1/4 - 20 6 ft-lbs
3700 & 7500 5/16 - 18 12 ft-lbs
15,000 & 30,000 7/16 - 14 22 ft-lbs
TORQUE TABLE

ITEM PART NAME
1HOUSING 2 BEARING 3 O-RING, BEARING CAP 4 BEARING CAP 5 PINION 6 NUT, TIE ROD 7 LOCKWASHER, TIE ROD 8 TIE ROD
10 O-RING, PINION 11 RELIEF VALVE 12 CYLINDER TUBE 13 PISTON - BACK-UP RING
ITEM PART NAME
14 SEAL, PISTON 15 O-RING, CYLINDER O.D. 16 PISTON RACK 17 CYLINDER HEAD 23 BACK-UP RING, CYLINDER HEAD 24 O-RING, CYLINDER HEAD 25 SET SCREW - BEARING CAP 26 NYLON PELLET - BEARING CAP
STANDARD MODELS 900 THROUGH 30,000
ALWAYS USE SERIAL NUMBERS AND MODEL NUMBERS
WHEN ORDERING PARTS.

DISASSEMBLY
1. Loosen jam nut, washer (3700/7500) and thread seal. Screw adjustor out of cylinder
head. Remove thread seal, washer (3700/7500) and jam nut.
2. Thoroughly clean and inspect all parts for wear or damage. Replace with new parts
as required.
RE-ASSEMBLY
NOTE: MUST BE RE-ASSEMBLED BEFORE CYLINDER HEAD IS MOUNTED TO
CYLINDER TUBE.
1. Install jam nut, washer (3700/7500) and thread seal on adjustor.
2. Screw adjustor into the cylinder head. Thread into head until adjustor is ush with
the inside of the cylinder head (Approx. 6-7 turns).
3. Adjust rotation at test. Turning adjustor clockwise reduces rotation, counter-
clockwise increases rotation.
NOTE: ADJUSTMENTS SHOULD NOT BE MADE WHILE UNIT IS UNDER PRESSURE. FOR
DUAL RACK UNITS, BOTH ADJUSTORS AT EACH END OF STROKE MUST BE SET
EQUALLY SO END OF STROKE LOAD IS EQUALLY ABSORBED BY (2) CYLINDER
HEADS.
DISASSEMBLY
1. Remove cover screw and cover screw seal.
2. Loosen the adjustable stop-set screw.
3. With cylinder head removed from cylinder tube, the adjustor can be removed by
screwing out towards the inside of the cylinder head with a hex wrench
4. Remove nylon pellet and inspect for wear and damage. Replace with new pellet
if required.
RE-ASSEMBLY
NOTE: MUST BE RE-ASSEMBLED BEFORE CYLINDER HEAD IS MOUNTED TO
CYLINDER TUBE.
1. Screw adjustor into cylinder head from inside cylinder head face. Screw adjustor in
until ush or below the surface of the cylinder head so rotation can be adjusted
at test.
2. Install nylon pellet and set screw but do not tighten until adjustment is set.
3. Adjust rotation at test. Turning adjustor clockwise reduces rotation, counter-
clockwise increases rotation.
NOTE: ADJUSTMENTS SHOULD NOT BE MADE WHILE UNIT IS UNDER PRESSURE.
FOR DUAL RACK UNITS, BOTH ADJUSTORS AT EACH END OF STROKE MUST
BE SET EQUALLY SO END OF STROKE LOAD IS EQUALLY ABSORBED BY (2)
CYLINDER HEADS.
4. When adjustment is complete, tighten set screw to lock position.
5. Install cover screw seal and cover screw.
DISASSEMBLY
NOTE: CYLINDER HEAD MUST BE REMOVED FROM THE CYLINDER TUBE
BEFORE DISASSEMBLY.
1. Remove jam nut.
2. Screw adjustor out of the cylinder head. Remove O-ring and back-up ring from
adjustor head.
3. Thoroughly clean and inspect all parts for wear or damage. Replace with new parts
as required.
RE-ASSEMBLY
NOTE: MUST BE RE-ASSEMBLED BEFORE CYLINDER HEAD IS MOUNTED TO
CYLINDER TUBE.
1. Install new back-up ring and O-ring on adjustor head making sure the at of the
back-up ring is on the cylinder head side of the seal groove and the curved side is
toward the O-ring and cylinder tube side. Make sure the O-ring is installed in the
curved portion of the back-up ring.
2. Screw adjustor into the cylinder head from inside of the cylinder head. Screw
adjustor all the way in so rotation can be adjusted at test.
3. Adjust rotation at test. Turning adjustor clockwise reduces rotation, counter-
clockwise increases rotation.
4. Tighten jam nut.
NOTE: ADJUSTMENTS SHOULD NOT BE MADE WHILE UNIT IS UNDER PRESSURE.
FOR DUAL RACK UNITS, BOTH ADJUSTORS AT EACH END OF STROKE MUST
BE SET EQUALLY SO END OF STROKE LOAD IS EQUALLY ABSORBED BY (2)
CYLINDER HEADS.
0° TO 30° EXTERNAL ADJUSTABLE STOPS (MODELS 900-7500)
0° TO 5° INTERNAL ADJUSTABLE STOPS (MODELS 3700-30,000)
0° TO 30° EXTERNAL ADJUSTABLE STOPS (MODELS 15,000 & 30,000)
ITEM QTY PART NAME
23 1 BACK-UP RING
24 1 O-RING
28 1 EXTERNAL ADJUSTOR, CYLINDER HEAD
29 1 JAM NUT
30 1 THREAD SEAL
79 1 EXTERNAL ADJUSTOR, FIXED CUSHION
ITEM QTY PART NAME
32 1 CYLINDER HEAD
33 1 0OTO 5OINTERNAL ADJUSTABLE STOP
34 1 SET SCREW - ADJUSTABLE STOP
35 1 THREAD SEAL - COVER SCREW
36 1 COVER SCREW
37 1 NYLON LOCKING PELLET
ITEM QTY PART NAME
23 1 BACK-UP RING
24 1 O-RING
28 1 EXTERNAL ADJUSTOR, CYLINDER HEAD
29 1 JAM NUT
79 1 EXTERNAL ADJUSTOR, FIXED CUSHION

FOR FURTHER MAINTENANCE INFORMATION CONTACT
YOUR NEAREST REPRESENTATIVE OR
MOOG FLO-TORK, ORRVILLE, OHIO 44667
Moog Flo-Tork 1701 N. Main St. P.O. Box 68, Orrville, Ohio 44667-0068
PHONE: [phone] FAX: [phone]
DISASSEMBLY
NOTE: DO NOT REMOVE CUSHION NEEDLE WHILE UNIT IS
UNDER PRESSURE.
1. Remove cushion needle jam nut and cushion needle from
cylinder head.
2. Remove O-ring and back-up ring. Replace with new parts during
re-assembly.
3. Remove cylinder head.
4. Remove cushion check retaining ring from piston rack.
5. Remove cushion check retainer, cushion check and compression
spring from piston rack.
6. Thoroughly clean and inspect all parts for wear or damage, replace
parts as required.
RE-ASSEMBLY
1. Install compression spring, cushion check, and cushion check retainer
in piston rack.
2. Secure in place with the retaining ring.
3. Install new back-up ring on cushion needle making sure the curved
side faces toward the needle end.
4. Install a new O-ring on the cushion needle making sure the O-ring ts
into the curved side of the back-up ring.
5. Re-install cylinder head.
6. Insert the cushion needle in the cylinder head, being careful not to
damage the seals. Tighten as far as possible, then loosen ½ turn.
7. Install jam nut.
8. Adjust cushion during testing as follows:
NOTE: DO NOT ADJUST WHILE UNIT IS UNDER PRESSURE.
A. Control needles of the cushion are installed and locked 1½ turns
from closed when assembled at the factory to prevent premature
damaging of the actuator during installation and start-up.
B. Increase cushioning – loosen cushion needle jam nut ½ to 1 turn.
Turn cushion needle clockwise ⁄ turn. Lock jam nut and check
cushion action.
NOTE: NEVER COMPLETELY CLOSE CUSHION NEEDLES.
C. Decrease cushioning – loosen cushion needle jam nut ½ to 1 turn.
Turn cushion needle counter-clockwise ⁄ turn. Lock jam nut and
check cushion action.
NOTE: CAUTION IS TO BE TAKEN WHEN ADJUSTING THE CUSHION
NEEDLE THAT IT HAS ADEQUATE THREAD ENGAGEMENT AND
WILL NOT BLOW OUT OF HOLE.
D. Continue adjusting cushion needles in the above described
manner until the desired cushioning eect is obtained.
SEAL LEAKAGE
MOOG FLO-TORK ROTARY ACTUATORS MAY BE CHECKED FOR PISTON SEAL LEAKAGE AS FOLLOWS:
1. SET UP ACTUATOR WITH RELIEF FITTING UP.
2. PRESSURIZE CYLINDER PORTS INDIVIDUALLY.
3. IF OIL FLOWS FROM RELIEF PORT AFTER PISTON RACK HAS COMPLETED ITS TRAVEL AND IS HELD FOR 3 MINUTES UNDER PRESSURE, ALL PISTON SEALS
SHOULD BE REPLACED.
ITEM QTY PART NAME
64 1CUSHION PISTON RACK
66 1 CUSHION CYL. HEAD - ADJUSTABLE
67 1 COMPRESSION SPRING
68 1 CUSHION CHECK
69 1 RETAINING RING
73 1 O-RING - CUSHION NEEDLE
74 1 BACK-UP RING - CUSHION NEEDLE
75 1 CUSHION NEEDLE
76 1 CUSHION CHECK RETAINER
77 1 JAM NUT
ALWAYS USE SERIAL NUMBERS AND MODEL NUMBERS WHEN ORDERING PARTS.
ADJUSTABLE CUSHION (MODELS 900-30,000)