WPT POWER PTO Manual

TYPE 1
PTO
INSTALLATION AND
MAINTENANCE MANUAL
WPT Power Corporation
1600 Fisher Road - Wichita Falls, TX 76305
P.O. Box 8148 - Wichita Falls, TX 76307
Ph. 940-761-1971
www.WPTpower.com

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1.0 INTRODUCTION
1.1 The WPT Power Corporation PTO
1.2 Product identification numbers
1.3 Calculating required torque capacity
2.0 SPECIFICATIONS
2.1 Flywheel dimensions
2.2 Bell housing dimensions
2.3 Allowable side pull
2.4 Maximum RPM
3.0 MOUNTING THE SHEAVE
3.1 Removing the sheave housing
3.2 Removing the outboard bearing
3.3 Installing the sheave
3.4 Replacing the outboard bearing
3.5 Replacing the sheave housing
4.0 INSTALLATION
4.1 Flywheel and flywheel housing alignment checks
4.2 Lubrication prior to installation
4.3 Mounting the PTO on the engine
4.4 Installing or replacing belts
5.0 OPERATION
5.1 Clutch engagement procedure
6.0 LUBRICATION
6.1 Grease specification
6.2 Grease specification for cold conditions
6.3 Lubrication intervals
6.4 Bearing operating temperature
7.0 MAINTENANCE
7.1 Inspecting and adjusting the clutch
7.2 Adjusting the clutch on the engine
7.3 Adjusting the clutch removed from the engine
8.0 DISASSEMBLY
8.1 Removing the PTO from the engine
8.2 Removing the sheave housing and belts
8.3 Removing the outboard bearing
8.4 Removing the bell housing
8.5 Removing the clutch from the PTO
8.6 Removing the inboard bearing
9.0 ASSEMBLY
9.1 Preparing the shaft
9.2 Assembling the clutch
9.3 Assembling the PTO
9.4 Installing the sheave housing
10.0 WARRANTY

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1.0 INTRODUCTION
1.1 The WPT Power Corporation PTO is the most rugged PTO available on the market today. Follow the
procedures detailed in this Installation Maintenance Manual for years of service.
1.2 When ordering parts, use the part number from the Bill of Materials supplied with this unit. Also, please
include the assembly number and the serial number from the unit itself. These will be found on a metal
tag riveted to the bell housing. Your WPT Distributor can provide a copy of the Bill of Materials if the one
provided should become lost.
1.3 When performing installation and maintenance functions, refer to the drawing at the back of this manual.
The references on the drawing in this manual DO NOT correspond to the references on the assembly
drawing and Bill of Materials. Do not use the item numbers from the drawing in this manual for ordering
parts.
2.0 SPECIFICATIONS
2.1 See Chart 3 for flywheel dimensions.
2.2 See Chart 3 for flywheel housing dimensions.
2.3 See Chart 4 and 5 for the allowable side pull of your PTO.
2.4 The maximum RPM is listed in Chart 4 and 5 for your PTO size.
3.0 MOUNTING THE SHEAVE
3.1 Removing the sheave housing
3.1.1 If a sheave has not been mounted, mark the shaft in the center of the distance between the
bearing end caps(33)
3.1.2 Remove the 6 socket head bolts (47) and 12 socket head bolts (40) holding the sheave housing
to the bearing housing and bell housing.
3.1.3 Attach approved lifting eyes in the 3/4-10 NC holes in the ribs on the side of the housing if the
PTO is in a horizontal position.
3.1.4 Attach a pattern of lifting eyes in the ½-13 holes in the sheave housing if the PTO is in a vertical
position.
3.1.5 If the housing does not separate easily, insert (2) 1/2-13 jack bolts in the end of the bell housing
and tighten these evenly to move the bell housing off the bearing housing boss. The sheave
housing weighs approximately 500 lbs. for the 14” and 18” clutch and approximately 600 lbs. for
the 21”.
3.2 Removing the outboard bearing
3.2.1 Remove the 6 socket head cap screws(52) joining the bearing end caps(32) & (33) to the
bearing carrier(41).
3.2.2 Slide the bearing carrier off the bearing.
3.2.3 Bend the locking tab of the lockwasher(48) out of the locknut(51). Remove the locknut and
washer.
3.2.4 Remove the outboard seal spacer(43).
3.2.5 Take precautions to keep the bearing clean. If the bearing does not slide easily off the shaft,
install a bearing puller with splitter plates behind the bearing and remove it from the shaft. Do
not pull on the bearing end cap(33). The shaft has a ¾-10 thread at the bottom of the rotary
coupling pocket.
3.2.6 Remove the seal spacer(43).

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3.3 Installing the sheave
3.3.1 If the key(57) is not in the shaft, install it now. Be sure it seats in the bottom of the slot.
3.3.2 Measure the distance from the top of the key to the opposite side of the shaft.
3.3.3 Compare this measurement to the mating dimension in the sheave or bushing and adjust the
key height if necessary.
3.3.4 Slide the sheave onto the shaft and lock in the approximate center determined in 3.1.1 above.
3.4 Replacing the outboard bearing
If the outboard bearing(45) is not assembled as a unit with the bearing carrier(41), seal housings
(32 & 33), and seals(36), go to section 9.3.24
3.4.1 Slide the seal spacer(43) onto the shaft until it seats against the shoulder.
3.4.2 Install the outboard bearing(45) with its carrier(41), seal housings(32 & 33), and seals(36) onto
the shaft. Use a light coating of grease on the seal ring and be careful to not damage the seal.
3.4.3 Slide the remaining seal spacer(43) onto the shaft. Use a light coating of grease on the seal ring
and be careful to not damage the seal.
3.4.4 Install the bearing lockwasher(48) and locknut(51) tightening the nut ¼ turn past makeup or
hand tight. Lock the nut with one of the tabs of the lockwasher.
3.4.5 If the rotary coupling(50) was removed, install it in its counterbore and lock in place with ring(49)
and 4 socket head bolts(26).
3.5 Replacing the sheave housing
3.5.1 Refer to 9.4.1
4.0 INSTALLATION
4.1 Flywheel and flywheel housing alignment checks
It is strongly recommended that these dial indicator checks be made prior to installation of the
PTO, especially on new engines or when a previous PTO failure might indicate an alignment
problem.
4.1.1 Flywheel to housing face runout check. (see Figure 3)
Mount the indicator base on the face of the flywheel and position the dial indicator tip
perpendicular to the flywheel housing mounting face. Rotate the flywheel 360 degrees while
holding pressure against the crankshaft thrust bearing.
SAE #1 Housing: 0.012 inches (0.305 mm)
SAE #1/2 Housing: 0.014 inches (0.356 mm)
SAE #0 Housing: 0.016 inches (0.406 mm)
SAE #00 Housing: 0.019 inches (0.483 mm)
4.1.2 Check flywheel housing bore runout. (see Figure 4)
Mount the indicator base on the face of the flywheel and position the dial indicator tip so its
movement is perpendicular to the pilot bore of the flywheel housing.
Rotate the flywheel through 360 degrees. The total indicator reading should not exceed:
SAE #1 Housing: 0.012 inches (0.305 mm)
SAE #1/2 Housing: 0.014 inches (0.356 mm)
SAE #0 Housing: 0.016 inches (0.406 mm)
SAE #00 Housing: 0.019 inches (0.438 mm)
4.1.3 Check flywheel face runout. (see Figure 5)
Mount the indicator base on the flywheel housing and position the dial indicator tip so that its
movement is perpendicular to the face of the flywheel. Position the indicator tip near the drive
ring mounting bolt circle diameter. Rotate the flywheel 360 degrees while holding pressure
against the crankshaft thrust bearing.

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The total indicator reading should not exceed 0.011 inches (0.279 mm)
4.1.4 Check flywheel pilot bore runout. (see Figure 6)
Mount the indicator base on the flywheel housing and position the dial indicator tip so its
movement is perpendicular to the face of the flywheel. Rotate the flywheel through 360 degrees.
The total indicator reading should not exceed 0.005 inches (0.127 mm)
FIGURE 3 FIGURE 4
FIGURE 5 FIGURE 6

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4.2 Lubrication pior to installation
4.2.1 The WPT PTO is lubricated at the factory with Lubriplate1200-2 lithium based grease.
Lubrication should be “topped off” prior to being placed in service. See Section 6 for lubrication
instructions
4.3 Mounting the PTO on the engine
Alternate methods are described to align the friction discs.
4.3.2 (Requires air supply) Use the drive ring (2) provided with the PTO or remove the drive ring from
the engine flywheel to use as an alignment gauge. Place the drive ring over the friction discs.
Center the drive ring relative to the O.D. of the clutch body. Engage the clutch with 100 psi
compressed air. Be sure there is adequate hose length to reach the back of the engine.
4.3.2 Remove the drive ring.
4.3.3 (No Air Required) Use a long handled screwdriver or other tool to align the friction disc teeth
with the teeth of the drive ring. Use caution when installing the PTO to avoid damaging the teeth
of the friction discs
4.3.4 Install the drive ring on the engine flywheel making sure that the ring is seated in the locating
bore. Use SAE Grade 5 bolts (or equivalent) with lockwashers and torque to the specifications in
Chart 1 or to the engine manufacturers torque recommendation. Use the engine manufacturer’s
torque recommendation if different from that in Chart 1.
4.3.5 Slowly draw the PTO toward the engine. This can be done by installing 3 or 4 equally spaced
lengths of all-thread with nuts into the flywheel housing and tightening these while supporting
the weight of the PTO with a hoist or cribbing.
4.3.6 When the PTO is fully in place, remove the studs if used and replace with SAE Grade 5 bolts (or
equivalent) with lockwashers and torque to the value in Chart 1. Use the engine manufacturer's
torque recommendation if different from that in Chart 1.
4.4 Installing or replacing belts
To install/replace belts, the customer’s support bracket and sheave housing must be removed.
4.4.1 Remove outboard support bracket
4.4.2 Remove the 6 socket head bolts (47) and 12 socket head bolts (40) holding the sheave housing
to the bearing housing and bell housing.
4.4.3 Attach approved lifting eyes in the ¾-10 NC holes in the ribs of the sheave housing.
4.4.4 If the housing does not separate easily, insert (2) 1/2-13 jack bolts in the end of the bell housing
and tighten these evenly to move the bell housing off the bearing housing boss. The sheave
housing weighs approximately 500 lbs. for the 14” and 18” clutch and approximately 600 lbs. for
the 21”.
4.4.5 Install/replace belts.
4.4.6 Reposition the sheave housing on the bell housing (30) and outboard bearing carrier (41).
4.4.7 Align bolt holes and start socket head bolts (47). Supporting the sheave housing with cribbing or
threaded rods screwed into the bell housing will aid assembly.

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4.4.8 Evenly tighten socket head bolts (47) to the values from Chart 1.
4.4.9 Remove threaded rods, if used, and install socket head bolts (40). Tighten to the values from
Chart 1.
4.4.10 Replace outboard support bracket and adjust belt tension.
Check and adjust belt tension after the first several hours of operation.
5.0 OPERATION
5.1 Clutch engagement procedure
5.1.1 Insure that hose or pipe sizes are adequate to supply the air to the clutch. Hoses or pipe size of
1/2 inch should be a minimum for short runs. Use 3/4 inch size if runs are longer than 15 feet.
5.1.2 Where high inertia loads must be started, engaging the clutch at idle speed may stall the engine.
High inertia loads may be brought up to speed by engaging the clutch for short periods (1
second) at intervals long enough to prevent excessive heat build up in the friction discs. With
extremely high loads, the engine may have to be operated at higher speeds while engaging the
clutch.
5.1.3 Once the load is turning with the clutch fully engaged, the engine RPM may be increased.
Special air circuitry may be used to regulate clutch engagement. Consult WPT Power
Transmission for recommended equipment.
NOTE:
UNDER NO CIRCUMSTANCES should the clutch be slipped for more than several seconds
without either fully engaging the clutch or completely disengaging the clutch to allow it to cool.
Any excessive vibration in the PTO should be cause for investigation. All rotating parts of the
WPT PTO are balanced at the factory.
6.0 LUBRICATION
Re-lube before placing in service
6.1 Grease specification
The WPT PTO is lubricated at the factory with Lubriplate1200-2, lithium base grease with an EP
(extreme pressure) additive. This will serve under normal ambient conditions up to 2100 RPM at a
maximum bearing temperature of 2OO deg. F. (93.3 deg. C.)
6.2 Grease specification for cold conditions
For ambient temperatures below -25 deg. F. (-32 deg. C.), LubriplateMAG-1 may be substituted.
Grease Caution:
Do not mix sodium or calcium based greases with lithium based grease.

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6.3 Lubrication intervals.
There are only two places on the WPT PTO that require lubrication. Each is connected to the bearing
cavity with the excess grease being forced out of a relief valve on the bottom of the unit. The small
amount of grease expelled is an indication that enough grease is being provided.
6.3.1 Every 75 hours of operation, add enough grease to expel a small amount from the relief valves.
6.3.2 Every 300 hours of operation, flush the bearing with approximately 7.5 oz. (1/2 tube).
These lubrication intervals are suggested. The operator is responsible for establishing
lubrication intervals according to the duty cycle and operating conditions in which the
equipment is used.
6.3.3 CLUTCH: No lubrication is required.
6.3.4 ROTO-COUPLING (50):Normally no lubrication is required. If equipped with grease fittings or
oil cups, any good bearing oil or grease can be used, but care should be taken not to over
lubricate.
6.4 Bearing operating temperature.
Operating temperature range is normally between 170 deg. F. and 200 deg. F. (76.7 to 93.3deg. C.).
Higher ambient temperatures will cause the bearings to run hotter. More frequent lubrication intervals
and/or lubricant designed for higher operating temperatures will be required if the unit is to be used in
this environment. Consult the factory for lubricant recommendations where ambient temperatures are
consistently above 100 deg. F.(38 deg. C.)
Note:
Do not rely on checking bearing temperature with the hand. Acceptable bearing temperatures are
normally hotter than the hand can stand for more than a second. A contact type thermometer should be
used to take accurate temperature measurements.
7.0 MAINTENANCE
The WPT PTO uses an air operated clutch which does not need frequent adjustment. It does
however, require periodic inspection to determine if friction discs and/or drive plates have
worn, increasing clutch clearance. The clutch should be adjusted if the movement of the
pressure plate is more than the value for that clutch found in Chart 2.
7.1 Inspecting and adjusting the clutch
7.1.1 Remove power (stop the engine) and tag any remote start devices.
7.1.2 Remove hand hole covers.
7.1.3 With a flashlight and short scale, measure the movement of the pressure plate as the
clutch is engaged and disengaged. Compare this measurement to that shown in Chart
2.
7.1.4 To adjust the clutch without removing the PTO from the engine, proceed to step 7.2. To
remove the PTO and rebuild the clutch, proceed to step 8.1

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It is good to periodically remove dirt and accumulated dust from the clutch. Wear a mask and
eye protection while doing this. WPT friction material is asbestos free.
7.2 Adjusting the clutch on the engine
7.2.1 Remove the air hoses(23) connecting the shaft to the airtube.
7.2.2 Remove the hose adapters(22)
7.2.3 Remove the 4 socket head cap screws(19) in the airtube holding plate(17).
7.2.4 Slide the airtube holding plate(17) and airtube(16) back to expose the shims(18).
7.2.5 With snips or saw, cut the necessary number of shims and remove them.
7.2.6 Replace the airtube and airtube holding plate. Torque the 4 socket head cap screws to
the value from Chart 1.
7.2.7 Replace fittings and hoses.
7.2.8 Check clutch clearance per 7.1.3 above.
7.2.9 Replace hand hole covers and remove tags from remote starting devices.
7.3 Adjusting the clutch with PTO removed from engine
7.3.1 See section (9.2.8)
Whenever the PTO is removed from the engine, it is recommended that the hub and drive ring
teeth be checked for wear. To do this, lay a straight edge along the side of the teeth. Any groove
worn .015” (.38mm) should indicate replacement of that part.
Examine the friction surfaces of the center plates (12) and floating plate (13) for heat checking
and surface flatness. Flatness should be within .005” (.13mm) and the two sides of the
centerplates should be parallel within the same amount.
Most damage to WPT clutches is a result of misalignment or low operating pressure.
Misalignment will cause premature wear of teeth (friction disc, center plates, hub and drive ring),
and if extreme, may cause breakage of these parts. Low air pressure may cause the clutch to
slip. Low air pressure or low air volume may cause the clutch to engage slowly. Slippage
generates heat, which if excessive, will shorten the life of friction discs, insulator plate and
airtube. A clutch that is suspected of slipping should be removed from service for examination or
repair.
8.0 DISASSEMBLY
(Refer to PTO Illustration at the back of this manual)
8.1 Removing the PTO from the engine.
8.1.1 Use a hoist or other suitable lifting equipment to support the weight of the power take-
off. Attach lifting devices at several places or use cribbing to support the PTO in a
horizontal position during removal.
Caution:
The PTO weighs in excess of l000 lbs. (454 Kg.) Use approved lifting eyes and procedures to
prevent accident or injury.

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8.1.2 Remove air hoses and other connections to the PTO
8.1.3 Remove the mounting bolts between PTO and flywheel housing, removing those
located near the top last. The PTO should separate from the flywheel housing. If the
PTO doesn't separate, gently pry the flanges apart until the housing is removed from the
engine flywheel housing pilot diameter.
8.1.4 Use care when removing the PTO from the engine to avoid damage to grease fittings,
friction disc teeth, and other components.
8.2 Removing the Sheave Housing and Belts.
8.2.1 Place the PTO on the floor, clutch down, supported by wood blocks under the bell
housing. Use adequate support to keep the PTO from tipping.
8.2.2 Refer to 3.1 of this manual.
8.2.3 Slide the belts off the pulley(s).
8.2.4 The sheave housing, if replaced at this time, will help balance the PTO.
8.3 Remove the outboard bearing
8.3.1 Bend the tab out of the slot on the bearing lock nut (51) and remove the nut and
washer(48).
8.3.2 Remove 6 flat head socket cap screws (52) and slide the bearing end cap (32) off of the
shaft.
8.3.3 Slide the seal spacer (43) off of the shaft.
8.3.4 Slide the bearing carrier (41) off the bearing and off of the shaft.
8.3.5 Slide the bearing off the shaft. If a puller is necessary, use splitter plates behind the
bearing. Do not pull on the bearing end cap (33). The shaft is tapped ¾-10 at the bottom
of the rotary coupling pocket.
8.3.6 Remove the seal spacer (43).
8.4 Removing the bell housing
8.4.1 Remove 6 socket head cap screws (38) and lift the bell housing off the inboard bearing
carrier (39). If the bell housing does not lift off easily, insert jack bolts in the threaded
holes provided and tighten these evenly to separate the two.
8.5 Removing the clutch from the PTO
8.5.1 Position the shaft with the clutch at the top.
8.5.2 Bend the tab out of the slot on the bearing lock nut (7) and remove the nut and washer.
8.5.3 Remove the hoses (23) and hose adapters (22).
8.5.4 Remove the set screw (21) in the clutch spacer (20) if equipped.
8.5.5 Remove the 4 hex head cap screws (10) holding the backplate (3) and remove the
backplate.
8.5.6 Remove the friction discs (4), pressure plates (12), springs (11), floating plate (13),
insulator plate (15) and airtube (16).