NACD C110AM User manual

C110AM & C111AM
Includes Installation, Operation, Maintenance and Overhaul Instructions
NACD Power Take-Off Service Manual
1015408AM

North American Clutch & Driveline
Rockford, Illinois
Phone: [phone]
[phone]
Fax [phone]
www.naclutch.com

North American Clutch & Driveline
Rockford, Illinois
Phone: [phone]
[phone]
Fax [phone]
www.naclutch.com
NOTICE
IMPORTANT INFORMATION
It is imperative that proper installation, maintenance, operation and safety procedures be followed explicitly
regarding products manufactured by North American Clutch & Driveline.
GENERAL:
Safe working and operating practices must be employed by all personnel working on, with, or near NACD
products. NACD will not be responsible for personal injury.
SAFETY NOTICE:
Accidents may result from use of manufactured products, resulting in possible danger to
person(s) or property. Therefore, it is important and imperative that correct, safe procedures
be followed. Products must be installed, maintained, operated and used in accordance with
the engineering information specied. Continual and repeated inspections and observations
should be employed as necessary to assure that safe operations and a safe environment exist
under prevailing conditions. Use proper guards and other suitable safety equipment, devices
and procedures that may be desirable or specied in safety codes, or as necessary to prevent
accidental injury to person(s) or property. These devices are neither provided by NACD nor are
they the responsibility of NACD.
OWNER / OPERATOR / USER RESPONSIBILITIES:
Knowledge of and performance of the procedures specied in this publication are the responsibility of
the owner(s), operator(s), user(s) and all person(s) working on or near the products described herein.
Following these procedures and explicit adherence to the information described should ensure safe and
reliable use, repair, and operation of products provided by NACD.
WARRANTY:
NACD’s limited Warranty is described in detail in this publication. It is the responsibility of the original
purchaser or manufacturer, successive buyers, users, third parties or employees to make themselves
aware of this warranty and all conditions it contains.

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INTRODUCTION
TROUBLE SHOOTING
DISASSEMBLY AND ASSEMBLY
CLEANING AND INSPECTION
UNIT ASSEMBLY AND INSTALLATION
PRIOR TO INSTALLATION
ENGINEERING DRAWINGS AND DATA
6
9
10
12
15
17
26
TABLE OF CONTENTS

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1.0 INTRODUCTION
GENERAL INFORMATION
Scope
This publication provides the information necessary for the operation and maintenance of NACD
equipment specied on the cover of this manual. Specic engineering details and per formance
characteristics can be obtained from the Engineering or Sales Department of NACD, Rockford,
IL USA.
Operation and maintenance personnel responsible for this equipment should have this manual
at their disposal and be familiar with its contents. Applying the information in the manual will
result in consistent performance from the unit and help reduce down time.
REPLACEMENT PARTS
Parts Lists
Illustrations with complete parts listings are provided in appropriate sections of the manual to
facilitate ordering spare or replacement parts.
All replacement parts or products (including hoses and ttings) must be of NACD origin or
equal, and otherwise identical with components of the original equipment. Use of any other
parts or products will void the warranty and may result in malfunction or accident, causing
injury to personnel and/or serious damage to the equipment.

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Ordering Parts
Renewal Parts and Service Parts Kits may be obtained from any authorized NACD distributor
or service dealer.
NOTE: Parts must be ordered from the bill of material. Bill of material numbers are stamped on
the unit's nameplate
If the bill of material sheet from which part numbers are obtained is unavailable, proceed as
follows:
1. Provide the gure number of the illustration con taining the part, the item number of the part,
the description of the part, and the quantity required.
2. Do not use the word "complete", but state exactly each item wanted.
3. Do not designate the quantity by "sets", but specify the part required.
4. Specify the model, bill of material, and serial number of the unit involved. These numbers are
stamped on the unit's nameplate.
Parts Shipment
Furnish the complete shipping destination and postal address. All parts shipments made from
NACD will be FOB or EXWorks Machesney Park, Illinois, USA. State specically whether the
parts are to be shipped by freight, express, etc. If shipping instructions are not speci ed on the
order, the equipment will be shipped the best way, considering time and expense. NACD will
not be responsible for any charges incurred by this procedure.
NACD, having stipulated the bill of material number on the unit's nameplate, absolves itself of
any responsibility resulting from any external, internal, or installation changes made in the eld
without the express written approval of NACD. All returned parts, new or old, emanating from
any of the above stated changes will not be accepted for credit. Furthermore, any equipment
which has been subjected to such changes will not be covered by an NACD Warranty.

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PREVENTIVE MAINTENANCE - TROUBLE SHOOTING
Frequent reference to the information provided in this manual regarding daily operation and
limitations of this equipment will assist in obtaining trouble tree operation. Schedules are
provided for the recommended maintenance of the equipment, and if observed, minimum
repairs aside from normal wear, will result.
In the event a malfunction does occur, a trouble shooting table is provided to help identify the
problem area, and lists information that will help determine the extent of the repairs necessary
to get a unit back into operation.
LIFTING BOLT HOLES
Most NACD products have provisions for attaching lifting bolts. The holes provided are always
of adequate size and number to safely lift the NACD product.
These lifting points must not be used to lift the complete power unit. Lifting excessive loads at
these points could cause failure at the lift point (or points) and result in damage or personal in
jury.
Select lifting eyebolts to obtain maximum thread engagement with bolt shoulder tight against
housing. Bolts should be near, but should not contact bottom of bolt hole
SAFETY
General
Safe operating practices should be employed by all personnel servicing this unit. NACD will not
be responsible for personal injury resulting from careless use of hand tools, lifting equipment,
power tools, or unaccepted maintenance working practices.

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Important Safety Notice
Because of the possible danger to person(s) or property from accidents which may result from
the use of manufactured products, it is important that correct procedures be followed. Products
must be used in accordance with the engineering information specied. Proper installation,
maintenance, and operation procedures must be observed. Inspection should be made as
necessary to assure safe operations under prevailing conditions. Proper guards and other
suitable safety devices or procedures that may be desirable or specied in safety codes should
be provided. These devices are neither provided by NACD nor are they the responsibility of
NACD.
SOURCE OF SERVICE INFORMATION
Each series of maintenance manuals issued by NACD is current at the time of printing. When
required, changes are made to reect advancing technology and improvements in state of the art.
For the latest service information on any NACD products, contact any NACD Distributor, or
write to the Sales Department, NACD, Rockford, Illinois, USA
WARRANTY: Equipment for which this manual was written has a limited warranty. For details of
the warranty, contact NACD, Rockford, Illinois, USA
TROUBLE SHOOTING
General
This section of the maintenance manual has been prepared to assist maintenance personnel
in trouble shooting equipment discussed in the manual. When trouble shooting the equipment,
always remember to consider the entire power package.

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Table 1: Trouble Shooting Chart for Power Take-Offs
DISASSEMBLY AND ASSEMBLY
Removal And Disassembly
1. Remove all attached parts from the output end of the clutch shaft (Figure 12, 9). Remove the
key (24) from the output end of the clutch shaft.
2. Remove the hex-head capscrews that secure the clutch housing (1) to the engine ywheel
housing. Use two 3/8-16 pusher screws in the tapped holes of the clutch housing ange, and
remove the power take-off from the engine.
3. Remove the hex-head capscrews that secure the driving ring (935) to the engine ywheel.
Remove the driv ing ring from the ywheel.
4. Support the clutch housing with wooden blocks on a work bench with the clutch end of the
unit facing up.
5. Use a standard bearing puller and remove the pilot bearing (25) from the clutch shaft.
6. Remove the jam nut (6) and the lock washer (151) from the tting (150) located in the clutch
housing. Push the grease tting (5) with the tting (150) into the clutch housing.
SYMPTOM
Clutch slippage.
Clutch dragging.
Excessive noise
and vibration.
1-1. Linkage out of adjustment.
1-2. Clutch driving plates worn.
1-3. Clutch driving plates are oil
soaked.
1-1. Adjust linkage.
1-2. Adjust clutch to compensate for wear.
Replace the plates if slippage continues.
1-3. Replace the driving plates. Replace
rear main oil seal.
2-1 Disassemble the clutch and clean it.
2-2 Replace warped plates.
3-1 Replace the pilot bearing.
2-1. Clutch parts are dirty.
2-2. Clutch driving plates,
oating plates, or center plate
is warped.
3-1. Pilot bearing is worn.
1
2
3
CAUSE REMEDY

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7. Straighten the bent portion of the hub nut lock washer (27) from the hub nut (26). Remove
the hub nut and lock washer from the clutch shaft. Discard the hub nut lock washer.
8. Fit a loose, steel, protective cap so it makes direct solid contact on the pilot bearing end of
the clutch shaft (8). While holding the operating lever (install lever, if removed) with signicant
pressure, (clutch in the engaged position) rap the shaft a sharp blow with a hammer on the
protective cap, to free the hub-and back plate and shaft tapers.
It is extremely important that the operating lever be held tightly in the engaged position during
the hammer rap. Failure to do so will result in damage to the bearings.
Remove the protective cap. Remove the clutch assembly (109) through (436) from the clutch
shaft (8). The hub key (28) should remove with the clutch assembly.
9. Pull the adjusting lock pin (115) out, and lock in the "out" position by inserting a piece of wire
or a small nail in the cross-drilled hole of the pin. Rotate the adjusting yoke assembly (113) and
sliding sleeve assembly (10) in a counterclockwise direction until they are removed from the
threaded hub of the hub-and-back plate (109).
10. Remove the oating plate (112), the driving plate (110) and the release springs (436) from
the hub-and-back plate assembly (109).
11. Remove the piece of wire or small nail from the adjusting lock pin (115).Remove the adjusting
lock pin (115) and the adjusting lock pin spring (152) from the adjusting yoke (113).
12. Straighten the cotter pins (412), and remove from the nger lever pins (409). Remove the
nger lever pins and the adjusting yoke (113), from the nger levers (123). Discard the cotter
pins.
13. Straighten the cotter pins (413), and remove from the lever link pins (415). Remove the lever
link pins, nger levers (123) and lever links (414) from the sliding sleeve (125). Discard the cotter
pins.
14. Remove the hex-head capscrews and hex nuts that secure the split collar (127) to the
sliding sleeve (125).

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15. Remove the exible hose assembly (32) from the split collar (127). Remove the 90 degree
tting (150) and the tting (149) from the exible hose (32). Remove the grease tting (5) from
the tting (150).
16. Remove the hex-head capscrew (12) and lock washer (13) and lock (11) that secure the
bearing retainer (10) against the clutch housing (1).Remove the bearing retainer (10) from the
clutch housing.
17. Press the clutch shaft (8) from the clutch housing (1). Press the clutch shaft (8) from the
clutch shaft bearings (9). Use a long shank (narrow) drift punch and through the two small holes
provided in the housing, tap the bearing cup (9) from the clutch housing.
18. Remove the round head capscrews (4) that secure the instruction cover plate (2) to the
clutch housing.
19. Loosen the hex-head capscrew (20) that secures the hand lever (20) to the operating shaft
(14). Remove the hand lever from the operating shaft.
20. Loosen the hex-head capscrews (17) and lock washers (17) installed in the throwout yoke
(17). Gently, tap one end of operating shaft (14), and roll out a Woodruff Key (15).Repeat this
procedure and remove the other key. Remove the operating shaft and the throwout yoke from
the clutch housing (1).
21. Remove the grease ttings (33) and (33) from the clutch housing (1) only if replacement of
the parts is necessary.
CLEANING AND INSPECTION
CLEANING
General
NOTE: Replace all oil seals, gaskets, 0-rings, lock plates, piston rings, snap rings, etc., as a part
of any maintenance or overhaul procedure. Shims which could be damaged or destroyed in
disassembly should also be replaced.

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1. Using solvent or steam cleaning, clean all parts. Parts cleaned with solvent or steam cleaned
must be dried and oiled immediately.
2. Examine all parts carefully for grit, dirt and abrasives and reclean them if necessary.
Cleaning Bearings
Do not remove grease in which new bearings are packed. Thoroughly wash bearings that have
been in service, in clean solvent. Soak bearings in solvent if they are particularly dirty or lled
with hardened grease.
Never dry bearing with compressed air. Do not spin bearings while they are not lubricated. Oil
bearings with SAE 10 engine oil immediately after cleaning. Be sure bearings are oiled before
installation.
Preventing Entrance of Dirt into Bearings
Dirt and grit in bearings are often responsible for bearing failure; consequently, it is important
to keep bearings clean. Do not remove grease from new bearings. Keep the wrapper on new
bearings until they are to be installed. Do not expose clean bearings if they are not to be
assembled at once. Wrap them with a clean lint free cloth or paper to keep out dust.
INSPECTION
Housings, Cast Parts and Machined Surfaces
1. Replace cast parts or housings that are cracked.
2. Inspect bores for wear, grooves, scratches and dirt. Remove burrs and scratches with crocus
cloth or soft stone. Replace parts that are deeply grooved or scratched.
3. Inspect oil passages for obstructions. If an obstruction is found, remove it with compressed
air or by working a wire back and forth through the passage and ushing it with solvent
4. Inspect machined surfaces for burrs, scratches, nicks and foreign matter. If such defects
cannot be removed with crocus cloth or a soft stone, replace the part.

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5. Inspect threaded openings for damaged threads. Chase damaged threads with a tap of the
correct size.
6. Inspect studs for damaged threads and looseness. Replace defective studs.
Bearings
1. Inspect bearings for roughness of rotation. Replace the bearing if the rotation is rough.
2. Inspect bearings for corrosion, scored, scratched, cracked, pitted or chipped races, and
for indication of excessive wear of balls or rollers. If one of these defects is found, replace the
bearing.
3. Inspect bearing bores and shafts for grooved burred or galled conditions that would indicate
that the bearing has been turning in its housing or on its shaft. If the damage cannot be repaired
with a crocus cloth, replace the part.
Bushings and Sleeves
Inspect bushings for size and out-of-roundness, scores, burrs, sharp edges, and evidence of
overheating. Remove scores with crocus cloth. If the bushing is out-of-round, deeply scored,
or excessively worn, replace it.
Splined Parts
Inspect splined parts for stripped, twisted, chipped or burred splines. Remove burrs with a soft
stone. Replace the part if other defects are found.
Clutch Plates
1. Inspect the clutch driving plates for cracked or glazed surfaces or for cracked, worn or
broken teeth. Check for excessive wear. Replace damaged or worn driving plates.
2. Inspect the oating plate for warpage or discolora tion. Replace damaged oating plate.
Snap Ring
Replace damaged or distorted snap rings.

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Springs
Inspect springs for broken or distorted coils and evidence of overheating. Replace the springs
if defects are found.
UNIT ASSEMBLY AND INSTALLATION
1. In stall the grease ttings (33) and (33) into the clutch housing (1) if removed during disassembly.
2. Install the operating shaft (14) halfway into the clutch housing. Slip the throwout yoke (17)
onto the operating shaft and push the shaft through the opening on the other side of the clutch
housing. Install one of the woodruff keys (15) into the operating shaft. Slightly move the throwout
yoke on the operating shaft and install the other key. Tighten the capscrews 27 ± 2 lbs.-ft.
torque.
3. Secure the hand lever (20) to the operating shaft with the 7/16-14 x 1 1/2 hex-head capscrew.
Tighten the screw to 50 lbs.-ft. torque.
4. Start one bearing cone (9) on the shaft (8) with the wide face of the inner race facing the
shoulder on the drive shaft. Place a steel ring approximately .25" thick over the shaft resting
against the narrow race of the bearing cone.
Do not allow any pressure to be applied against the bearing cage at any time. A damaged cage
will cause bearing failure.
Support beneath the steel ring on the bed of a press. Press the drive shaft (8) into the bearing
(9) until the shoulder on the drive shaft (8) is tight against the wide face of the bearing inner race.
Turn the drive shaft (8) over in the press. Press the second bearing (9) onto the drive shaft.
5. Support the clutch housing with wooden blocks on a work bench with the clutch end of the
unit facing up. Press the clutch shaft rear bearing cup (9) into the housing to bottom in its bore.
6. Install the clutch shaft with attached parts in the clutch housing. Press the forward bearing
cup (9) into the clutch housing against the bearing cone. Install the bearing retainer (10) onto
the shaft and into the housing. Adjust the bearing end play.
See ADJUSTMENT page 20 of this manual.

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7. Position the bearing retainer lock (11) against the clutch housing, and secure with a 5/16-18 x
1/2 hex head capscrew (12) and lock washer (13). Tighten the capscrew to 15 ± 2 lbs.-ft. torque.
8. Install the 1/8-inch grease tting (5) in the tting (150). Install the 90 degree tting (149) and
tting (150) on the exible hose (32). Install the exible hose assembly (32) in the trunnion on
the split collar (127).
9. Place the split collar (127) on the sleeve (125) in position and secure the collar to the sleeve
with two hex-head capscrews 5/16-24 x 2 (127) and nuts (127). Tighten the nuts to 27 ± 2 lbs.-
ft. torque.
10. Secure the eight lever links (414) to the sliding sleeve (125) with four lever link pins (415) and
four new cotter pins (413). Spread out the protruding split ends of the cotter pins. Secure the
four nger levers (123) to the adjusting yoke (113) with four lever pins (409) and cotter pins (410).
Spread cotter pins. Secure the four nger levers (123) to the lever links (414) with four lever link
pins (415) and four cotter pins (413). Spread cotter pins.
To prevent interference with adjacent parts, the cotter pins must not extend beyond 0.38 radius
of pin center after spreading.
11. Install the adjusting lock pin spring (152) and the adjusting lock pin (115) in the adjusting
yoke (113). Retain the adjusting lock pin with a wire or nail.
12. Place the hub-and-back plate (109) on a work bench with the threaded hub up. Place the
release springs (436), the driving plate (110), and the oating plate (112) in position on the hub-
and-back plate assembly (109).
13. Install the adjusting yoke assembly (113) with the sliding sleeve assembly (125) on the hub-
and-back plate assembly. Tighten the yoke (113) until snug against the oating plate (112). Final
clutch adjustment will be made later.
14. Partially install the clutch assembly onto the clutch shaft (8). Align the hub and shaft keyways.
Install key (28) into shaft and hub about two thirds of key length. Lower clutch assembly further,
engaging the throwout yoke with trunnions on the collar. Tap key into nal position.

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15. Secure the clutch assembly to the clutch shaft by installing a new hub nut lock washer
(127) and the hub nut (26). Place the locking washer (3) on top of the clutch. Apply a thin coat
of Loctite 271 to the threads of nut (2). Install and tighten nut against the locking washer, taking
care not to shear the lock tab. Torque nut to 180 ft-lbs. Bend a section of the hub nut lock
washer against a at on the hub nut after the nut is securely in place.
16. Insert the grease tting (Figure 12,5), with the exible hose assembly (32) attached, through
the hole in the clutch housing (1). Secure in place with the 5/8-inch lock washer (151) and the
jam nut (6).
PRIOR TO INSTALLATION
Most NACD products mount directly onto the ywheel of the engine. Flywheel to driven
component interference is possible due to mismatch of components or other reasons. Therefore,
engine crankshaft endplay as well as ywheel alignment check must be made before the driven
component is installed.
After installation of the driven component, crankshaft endplay should be measured again.
Endplay at the second measurement should be the same as the rst. A difference in these
two endplay measurements could be an indication of interference. Consequently, the driven
component should be removed and the source of interference found and corrected.
NACD will not be responsible for system damage caused by engine to NACD component
regardless of the cause of interference. This engine crankshaft endplay check is considered
mandatory.
General
The PTO housing ange and pilot, and the engine ywheel and ywheel housing must be
checked for trueness. Make certain the engine ywheel and the ywheel housing are clean
prior to making the tests.

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Alignment -(Also reference SAE J-1033)
1. Bolt a thousandths increment dial indicator or gauge to the engine ywheel so that the
indicator is perpendicular to the face of the engine ywheel housing, and the indicator stem is
riding on the face of the ange. See Figure 2
2. Figure 2. Rotate the engine ywheel, always
keeping a thrust in the same direction, and
note the face deviation of the engine ywheel
housing ange. The face deviation must not
exceed the gures given in Table 2
All gures are Total Indicator Readings.
Table 2: Flywheel Housing Tolerances
3. With the indicator mounted as in the above paragraph, adjust the indicator stem so that it will
ride on the bore of the engine ywheel housing. See Figure 3.
4. Rotate the engine ywheel and note the bore ec centricity of the engine ywheel housing
bore. See Table 2.
5. Bolt a thousandths dial indicator or gauge to the engine ywheel housing so that the indicator
is perpendicular to the engine ywheel, and the indicator stem is riding on the inner face of the
ywheel. See Figure 4.
Rotate the ywheel. The variation of the face runout of the surface to which the driving ring is
bolted should not exceed 0.0005 per inch of diameter.
Figure 3: Checking Bore of Engine Flywheel
Housing
SAE
Housing
No.
00
0
1/2
1
2
3
4
5
6
.019
.016
.014
.012
.011
.010
.009
.008
.007
.019
.016
.014
.012
.011
.010
.009
.008
.007
Face
Deviations
Bore
Eccentricity

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6. With the indicator mounted as in the paragraph above, adjust the indicator stem so that it
will ride on the driving ring bore of the engine ywheel. See Figure 6. Rotate the ywheel. The
driving ring bore eccentricity of the engine ywheel should not exceed 0.005 inch maximum
total indicator reading. Thrust on the ywheel should be in one direction at all times to obtain a
correct reading.
7. Readjust the indicator so that the stem will
ride on the pilot bearing bore of the ywheel. See
Figure 5. Rotate the ywheel. The eccentricity of
the pilot bearing bore should not exceed 0.005
maximum total indicator reading. Eccentricity
between the driving ring pilot bore (Figure 6)
and pilot bearing bore (Figure 5) should not
exceed 0.009 inch total indicator reading.
INSTALLATION
Avoid excessive wear or scrubbing of parts due
to misalignment between the engine and the
Power Take Off. If wear is experienced check
the following:
Figure 4: Checking Driving Ring Surface
of Engine Flywheel
Figure 5: Checking Pilot Bearing Bore of
Engine Flywheel
Figure 6: Checking Driving Ring Bore of
Flywheel

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1. Excessive loads tend to deect parts to which power take-offs are mounted. To determine
deection under actual operating conditions, a dial indicator may be mounted on a rigid part of
the engine, such as the crankcase. or independently on the foundation . Readings taken before
the drive is installed, with the engine standing still and when under actual operating conditions,
will indicate the extent of such deection. In no case should the indicated deection exceed
.010" at the bearing in the power take-off housing.
2. Place two guide studs in the ywheel housing bolt circle, close to the horizontal center line,
to assist in aligning the PTO on the engine ywheel housing.
3. Swing the PTO into position on the engine ywheel, sliding the pilot bearing (Figure 12, 25)
carefully together and meshing the driving ring with the driving plates. Secure the PTO to the
ywheel housing with twelve hex-head capscrews and remove the guide studs used. Use SAE
standard torque rating to torque capscrews.
4. Rap the end of the output shaft with a soft hammer to relieve any preload due to the pilot
bearing being pressed into the ywheel.
ADJUSTMENTS
CLUTCH
General
Periodic clutch adjustments are necessary for the continued efcient use of this power take-off.
Be sure engine is off before adjusting the clutch. Adjusting the clutch with the engine running
may result in personal injury and/or damage to equipment.
NOTE: Clutches in new power take-offs require checking of adjustment after installation and
prior to operation.
New clutch plates have a wear-in period during which the clutch may require several
adjustments. The model C110 and C111 clutches described in this manual do not automatically
adjust to compensate for wear of the clutch facing(s), and therefore must be manually adjusted.
Maintaining the correct engagement pressure is the responsibility of the owner/operator.

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Clutch Adjustment
To adjust the clutch, proceed as follows:
1. Remove the instruction cover plate (Figure 12, 2) and turn the clutch until the adjusting lock
pin can be reached.
2. Disengage the adjusting lock pin and insert a cotter pin or nail into the small hole provided in
the adjusting lock pin to hold it in the disengaged position.
3. Turn the adjusting yoke (113) clockwise to tighten the clutch.
4. The clutch should be tightened as per the inspection plate until the required force is achieved
on the operating shaft (14) to engage the clutch.
Clutch adjustment should be checked on a newly placed in service power take-off after the
rst eight hours of operation. Adjustments should be made at the ten to fteen hour intervals
until the new plates are worn in. The owner/operator must periodically adjust the clutch to
ensure correct clutch operation. The clutch should be adjusted if the force required to engage
the clutch drops by 10-15% of the specied engagement force. Destructive damage may have
already occurred if engagement force is allowed to diminish to the point where the clutch fails
to carry the load (slippage), or if facing(s) have overheated.
After wear-in, clutch adjustment should be checked regularly. Heavy duty applications (rock
crushers,etc.) which have frequent engagements with long periods of clutch slippage will
require more frequent adjustments than light duty applications. Need for clutch adjustment
is also indicated if the clutch does not pull, heats up, or if the operating lever jumps out of
engagement.
In order to determine if clutch adjustment is necessary, operating shaft torque must be
measured. A torque wrench should be used at the cross shaft to measure engagement force.
The clutch should ENGAGE within the torque readings shown. An adapter, NACD part number
236484AM, may be obtained to provide a 1.5" hex nut at the end of the cross shaft. The adapter
may be used in place of the standard handle for the purpose of checking clutch adjustment
with a torque wrench, or it may be installed on the end of the cross shaft opposite the standard
handle. (Most PTOs have serrations on both ends of the cross shaft.) All NACD handles are cast
with this hex.
If operating shaft torque or hand lever effort is at or below minimum, adjust clutch until the
maximum force (for your model PTO) is required to engage the clutch.
NOTE: Do not adjust the clutch too tight. Forces above maximum may cause clutch component failure.