Electric PTO Clutch for Exmark and Warner

Experienced gardeners share their insights in answering this question :
I am going to presume that this clutch actually installs on the lower end of the engine crankshaft. There should be a bolt that goes up thru the center of the clutch into the shaft. There’s probably a spring or rod that will hold the outside of the clutch solid. Part of the clutch will be turning with the engine when it’s running and when you throw the switch to engage the clutch, the other portion is activated by the current to connect to the turning portion. To get the old one off, you’ll need to get under the mower with a socket wrench. These can be quite stubborn to break loose, as the engine will want to turn over as you turn the bolt. If you have a gear drive machine you may be able to let the transmission help hold the engine from turning, but that, too, is run by a belt, so it may slip. Worse case is to use an air impact wrench, which will apply pressure so fast that it will make the bolt turn without turning the engine. Good Luck.

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This operation is crucial to the overall functioning of riding mowers, and thus PTO clutch repair may need to be immediately performed on riding mower models that have a failed clutch. Fortunately, you can fix your clutch irrespective of your experience with PTO clutch installation.
If the PTO clutch is not getting power, if the clutch solenoid is defective, or if the clutch is worn out, the lawn mower blades will not engage. The PTO clutch is not repairable—if the clutch is defective, you must replace it.
PTO clutches generally overheat because of improper lubrication/greasing (both too much and too little can cause problems), excessive sideload, or a new installation. Operators are advised to reduce sideload and inspect grease levels first.
Clutch Actuator Function

In order to disengage the clutch, the ECU signals inlet valves (2.4. 1 and 2.4. 2) to open. This allows the pressurised air at port 1 to flow into the cylinder (1.1) causing the operating piston (1.2) to move to the left and apply the lever of the clutch.

Powershift PTO engagement problems could be from blocked hoses or fittings, bad connections or ground or the solenoid. Mechanical PTO engagement problems could originate from low air pressure, improper cable installation or back lash too tight.
Read the volts. If the battery output indicates 12.5 volts or below, charge the battery. The PTO clutch will not engage without sufficient voltage. Look for the in-line fuse between the electrical wiring harness from the lever switch to the PTO clutch assembly under the deck.
Engage the PTO switch. The clutch should have an amp draw of approximately 4.0 amps. If the meter reads significantly above or below 4.0 amps, there may be a shorted coil, faulty switch or battery causing the problem. The clutch assembly should be kept free from debris buildup.
A clutch that won`t engage at all means there is serious damage somewhere. Check for a bent linkage, a seized slave cylinder, or a seized throw-out bearing. Beyond those, check for binding in the linkage, a corroded cable, or a failed friction plate.
Changing clutch cables is a routine repair for all mechanics and can be done both kerbside as well as in the workshop, providing it is safe to do so.
“Riding” the clutch is the most common reason for premature clutch failure. Even the slightest pressure on the pedal will partially disengage the clutch, causing the release bearing, pressure plate and flywheel to overheat.
The clutch is operated by pushing on the clutch pedal inside the vehicle, which causes the clutch to disengage, and as the pedal is released the clutch will engage. Depending on the type of system the vehicle has, it will either have a hydraulic operated clutch or cable operated clutch.
Extreme overheating can cause irreversible dishing of the pressure plate leading to disengagement problems.
There are generaly two types of PTO overload clutch, a cam cut out clutch and a friction disc torque limiting clutch, commonly all refered to as “PTO Slip Clutches”.
The PTO (or power take-off) belt is part of a pulley system that operates the blades on your riding lawn mower. It runs off the electric clutch system in your engine.
What are the symptoms of the P0903 code? When the clutch actuator circuit is compromised, the actuator may malfunction. This can result in stalling, harsh shifting or failure to shift, and damage to other components within the clutch system.
Clutches can be categorized into two main classifications: friction clutches and fluid flywheel.
MZS Electromagnetic Clutch

Torque Range: 24.4 to 249.5 Nm / 18 to 184 ft-lbs. Clutch is designed for high torque small space environments where no slip and only a single engagement position is desired. Clutch can be used dry or in an oil bath.

Adjust the pressure by turning the valve stem with allen wrench in the hole through the spool. Screw stem up into block for more pressure and thread it down or out of block for less pressure.
If the product is Warner Electric, it will have a Warner Electric part number on a label located on back of the PTO itself, either laser etched onto the clutch housing or possibly a printed label affixed to the housing.
Warner Electric Power-take-off clutches (PTO) and clutch/brakes provide a means for the operator of agricultural equipment to remotely control the operation of tractor powered implements or other mechanical systems.
Home and Garden Geek adds that you should be able to loop one or two fingers over the same belt when the tractor is off and the belt is “engaged” and pull it gently away from the pullies. This translates to one or two pounds of force. If you need more than two fingers, your deck belt may be too tight.
PTO clutches generally overheat because of improper lubrication/greasing (both too much and too little can cause problems), excessive sideload, or a new installation. Operators are advised to reduce sideload and inspect grease levels first.
Cavitation can and will cause Structural and Errosive damage. Damaged power take off gearbox and Hydraulic Gear pump caused by over speed when driver forgot to disengage the PTO gear box from the main transmission.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

When you replace the pto clutch (717-04080), does it have a tight fit with a bracket or does it have a little play.
ANSWER : There shouldn’t be any play in it. This should fit snug unless you have rubber bushings on the bracket mount to help compensate the torque of the belt engaging.

Where is the fuse located on a LT1554 cub cadet
ANSWER : Check the connector and wires at the pto clutch. Sometime the movement will create a cut in the wiring you may be able to see. If so if the wire touches ground it will blow the fuse and if the wires touch each other it will short.
if the short is not there then the clutch is bad?BMW PARTS

With a cub cadet model #2518 year 2003 what engines can be used for replacement? Does it have to be vertico or horizontal?
ANSWER : I would replace with the same kind

How to remove a pto clutch? – kawasaki Fh641v 21hp 21 Hp Riding Lawn Mower Engine ()
ANSWER : Is this the electric clutch thats boted to the engines crank? if so you just need to remove the centre bolt and stabiliser bar and chatter spring if one fitted, remove the wiring from the clutch and it should just pull off.if its a bit stuck on the crank then try tapping it with a copper hammer

Electric clutch pto. wire pulled out of assymbly. I found the right replacement part . Do you need a puller to replace? Or does it just slide on and off?
ANSWER : It may not just slide off , but should be able to come off with hand tools.

When I engage the PTO, the blades don’t egage.
ANSWER : The first thing we need to to do is verify that there is adequate /(power 12 vdc) going to the electric clutch, you can do this by unplugging the clutch and check both wires 1 should have 12 volts and the other wire shoud read infinity to ground if this checks out replace the clutch, if you dont have 12vdc to the wire replace the relay

1806 cub cadet PTO blows fuse when engaged – Cub Cadet Lawn Mower Electric PTO Clutch Replaces CUB CADET 71704163
ANSWER : Check the pto switch..un hook it if thats it then replace

While cutting grass the pto clutch cuts off, i have to push switch in and back out to restart blades. I have replaced the switch and pto clutch
ANSWER : Pto kicks in and out while mowing was wondering if its electrical or something else i have a jd 420