Replacing The Oil Pump Husqvarna 142

Funny Pencil
To help the home craftsman, the most successful methods of repairing, restoring home appliances and motorized agricultural implements are offered. The principles of operation and operation of electrical equipment and available methods for its restoration are revealed. There are drawings, diagrams and development of homemade technical designs for small-scale production, as well as products for manual processing of land.

The operation of the oil plunger pump on a chainsaw.

The oil pump on chainsaws is valveless and is mounted on the crankcase of the chainsaw from the side of the saw chain drive. The role of the valve in these pumps is performed by a segmented cutout at the end of the plunger. The plunger is driven from the clutch by a pair of worm gear. It turns out that the pump plunger rotates in the same direction and at the same time it itself closes the inlet and outlet channels of the oil line in a cycle, combining the function of the valves.

When the segmented cutout at the end of the plunger opens the inlet of the oil supply line, the plunger moves slightly out of the pump chamber, thereby picking up oil from the line through the open hole.

As the plunger rotates further, the inlet channel of the pump oil chamber closes and the opening of the discharge channel opens. At the same time, the plunger moves inward and pumps the trapped oil into the oil channel to the lubrication point by the piston.

With one rotation around its axis, the plunger makes one reciprocating movement along its axis, the magnitude of the stroke of which is regulated by a screw with an eccentric transversely installed at the end of the plunger shaft. Some people like to call it a cam.

The eccentric rests against the central protrusion on the end of the plunger shaft, and the greater the angle of deflection of the adjusting screw, the further the eccentric located on it will push the plunger shaft away from itself. In the largest eccentric deviation, oil cannot be pumped out by the pump. The saw chain is not lubricated.

In addition to the central projection on the end of the plunger shaft, there is an annular projection with a profiled surface that determines the magnitude of the plunger stroke along its axis. That is, the level of oil capture and pumping.

A metal spring is mounted on the plunger shaft, which, resting on one side against the oil pump housing, constantly pushes the plunger shaft towards the adjusting screw.

The profiled surface of the annular protrusion is in contact with the cylindrical body of the adjusting screw. At the point of their contact, an interface is formed, which, when the plunger shaft rotates, sets a value that limits the movement of the plunger along its axis and affects the process of capturing and pumping oil by the plunger.

The oil pump will operate at maximum efficiency provided that the adjusting screw eccentric does not come into contact with the center lug on the plunger shaft end. As the adjusting screw rotates, the eccentric will move closer to the shoulder and push the plunger shaft away from it. In this case, the amount of oil supplied by the pump for lubrication will depend on the position of the eccentric relative to the protrusion on the plunger shaft, and in this example, the amount of oil supplied by the pump is controlled.

Funny Pencil Repairing the oil pump on a chainsaw

Any owner is pleased with a good technique, proven in practice and has justified itself more than once. The newest technology always surprises and alarms with its characteristics, surpassing the characteristics of very old technology, which is still in use by many.

Some masters always try to acquire for their business the equipment of well-known companies of a certain brand and incline their friends and acquaintances to this, others are guided by the price and buy only expensive things for themselves, and the manufacturer is not interested in them.

Where is the guarantee that any equipment we purchase fully complies with the quality certificate under which it is sold? Where is the longevity promised by the manufacturer if we operate their equipment in our conditions, and moreover, ‘feed’ it with our fuel and according to our recipes?

Nowadays, there are a lot of equipment that can be sold at different prices in different outlets. No one will tell you where and who assembled the same petrol cutter or chainsaw that you purchased. A well-known brand, and the assembly can be carried out in a nearby garage for components, perhaps even in a makeshift way.

A big problem that causes all kinds of breakdowns in most budget chainsaws is their poor-quality assembly, inadequate components, or even a negligent attitude towards the entire assembly process by unprepared assemblers.

Many chainsaw owners have noticed an oil stain in the place where their chainsaw rested or was stored. Oil under the saw does not start to leak immediately. And with poor assembly, more precisely, with poor-quality assembly of the chainsaw, an oil stain may appear immediately after refueling.

Affordable DIY solutions

Causes of oil leakage from the oil pump of the chainsaw.

Except for mechanical damage to the oil tank and oil supply system, there are not many reasons for oil leakage.

• Loose connection of the supply oil line with the inlet of the oil pump of the chainsaw and poor tightness between the hole of the oil tank and the line.
• Technical compliance with the dimensions of the plunger and the discharge chamber of the oil pump.
• Loose connection between the supply line and the oil pump outlet to the saw chain lubrication point.
• Violation of the tightness of the plunger chamber of the oil pump.

I will dwell on the last option in more detail, since it is in the event of a loss of tightness of the plunger chamber that oil leaks, and in saw structures, where the oil tank is located above the oil pump, oil flows out after a couple of days of idle time of the chainsaw.

Eliminate oil leakage from the chainsaw oil pump it is possible and all this happens quickly, if someone is good at a screwdriver and wrenches. If your chainsaw has passed a small working resource, then the problem is solved simply.

As I mentioned earlier, the guarantee of the trouble-free operation of your chainsaw is ensured not only by observing optimal operating conditions for it and using the manufacturer’s recommendations, it is also ensured by the appropriate quality of component parts, but most of all by the most high-quality assembly.

Let the part be manufactured on high-precision equipment, but when it is installed incorrectly or does not fix it with the appropriate effort, then the promised warranty from the manufacturer will disappoint you.

Like plunger type oil pump, installed on most models of budget chainsaws, simple in design. The principle of its operation does not differ from the operation of some plunger oil pumps of other categories of chainsaws.

I will briefly describe in my own words the principle of operation of a plunger-type oil pump of similar models, so that it would be a little clearer when familiarizing myself with my method of correcting oil leaks through the oil pump of a chainsaw.

Chainsaw plunger oil pump malfunctions and their elimination.

It often happens that oil is not supplied to the saw chain, even when the adjusting screw is in maximum oil supply. There are not many reasons:

• After disassembling the oil pump, the adjusting screw is set at 180 ° relative to its original position.

It is enough to reposition the adjusting screw or leave it that way. Then the screw positions for maximum and minimum oil supply () will be reversed.

• The profile surface of the annular ledge is worn out and no longer looks like a profile, but flat. The plunger does not move along its axis.

We change the oil pump or form a profile and sharpen the central protrusion at the end of the plunger shaft. In this case, the volume of the pump working chamber will slightly increase.

When adjusting the profile and the protrusion, it is necessary to maintain the same maximum dimensions in height relative to each other, so that when the adjusting screw is in the minimum mode, the plunger slightly pumps oil. The new pump has a central protrusion at the end of the plunger shaft about 0.3. 0.6 mm higher than the level of the annular profile, and in the position of the adjusting screw with a minimum oil supply, the oil pump does not work.

• Wear on the inner surface of the pump plunger chamber and the outer surface of the plunger.

This, usually, manifests itself with a previous defect or with what I will describe next. We change the oil pump or sort out the sets according to the size of the used one.

• Violation of the tightness of the working plunger chamber.

A little oil can be supplied to the lubrication point, but there is a lot of oil on the saw casing on the chain drive side.

The last example speaks of the plunger collar, which in many cases is installed in the opposite direction, with the collar outward. Some masters claimed that this is a cuff that captures oil into the pump chamber. But how does this cuff behave when inflated? Pass oil through itself?

Some people choose rubber rings instead of him, but believe me, this is not easy and very caring for the inexperienced. This method is good, but the tightness of the O-ring must be considered. If the ring sits tightly in place, then it will be necessary to replace the plunger spring, and there will also be increased wear of the mating unit of the adjusting screw and the plunger shaft. The wear of the plastic hub of the pump drive worm pair will also be added.

The ease of movement of the plunger is maintained by the use of a cuff that does not interfere with the return stroke at the moment the plunger is seized by oil and maintains sufficient tightness of the working chamber when oil is pumped.

At the first opportunity, at the chainsaws that come to me, I always disassemble the oil pump in order to be completely sure of the condition of the plunger and its cuff. In the case when the cuff is installed with the collar outward, then I reinstall it on the contrary, with the collar towards the working plunger chamber of the oil pump.

This is my method, which always justifies itself, provided that no one interfered with the design of the oil pump and the oil was supplied to the pump through the oil filter.

Chainsaw oil pump repair

Any owner is pleased with a good technique, proven in practice and has justified itself more than once. The newest technology always surprises and alarms with its characteristics, surpassing the characteristics of very old technology, which is still in use by many.

Some masters always try to acquire for their business the equipment of well-known companies of a certain brand and incline their friends and acquaintances to this, others are guided by the price and buy only expensive things for themselves, and the manufacturer is not interested in them.

Where is the guarantee that any equipment we purchase fully complies with the quality certificate under which it is sold? Where is the longevity promised by the manufacturer if we operate their equipment in our conditions, and moreover, ‘feed’ it with our fuel and according to our recipes?

Nowadays, there are a lot of equipment that can be sold at different prices in different outlets. No one will tell you where and who assembled the same petrol cutter or chainsaw that you purchased. A well-known brand, and the assembly can be carried out in a nearby garage for components, perhaps even in a makeshift way.

A big problem that causes all kinds of breakdowns in most budget chainsaws is their poor-quality assembly, inadequate components, or even a negligent attitude towards the entire assembly process by unprepared assemblers.

Many chainsaw owners have noticed an oil stain in the place where their chainsaw rested or was stored. Oil under the saw does not start to leak immediately. And with poor assembly, more precisely, with poor-quality assembly of the chainsaw, an oil stain may appear immediately after refueling.

The operation of the oil plunger pump on a chainsaw.

The oil pump on chainsaws is valveless and is mounted on the crankcase of the chainsaw from the side of the saw chain drive. The role of the valve in these pumps is performed by a segmented cutout at the end of the plunger. The plunger is driven from the clutch by a pair of worm gear. It turns out that the pump plunger rotates in the same direction and at the same time it itself closes the inlet and outlet channels of the oil line in a cycle, combining the function of the valves.

When the segmented cutout at the end of the plunger opens the inlet of the oil supply line, the plunger moves slightly out of the pump chamber, thereby picking up oil from the line through the open hole.

As the plunger rotates further, the inlet channel of the pump oil chamber closes and the opening of the discharge channel opens. At the same time, the plunger moves inward and pumps the trapped oil into the oil channel to the lubrication point by the piston.

With one rotation around its axis, the plunger makes one reciprocating movement along its axis, the magnitude of the stroke of which is regulated by a screw with an eccentric transversely installed at the end of the plunger shaft. Some people like to call it a cam.

The eccentric rests against the central protrusion on the end of the plunger shaft, and the greater the angle of deflection of the adjusting screw, the further the eccentric located on it will push the plunger shaft away from itself. In the largest eccentric deviation, oil cannot be pumped out by the pump. The saw chain is not lubricated.

In addition to the central projection on the end of the plunger shaft, there is an annular projection with a profiled surface that determines the magnitude of the plunger stroke along its axis. That is, the level of oil capture and pumping.

A metal spring is mounted on the plunger shaft, which, resting on one side against the oil pump housing, constantly pushes the plunger shaft towards the adjusting screw.

The profiled surface of the annular protrusion is in contact with the cylindrical body of the adjusting screw. At the point of their contact, an interface is formed, which, when the plunger shaft rotates, sets a value that limits the movement of the plunger along its axis and affects the process of capturing and pumping oil by the plunger.

The oil pump will operate at maximum efficiency provided that the adjusting screw eccentric does not come into contact with the center lug on the plunger shaft end. As the adjusting screw rotates, the eccentric will move closer to the shoulder and push the plunger shaft away from it. In this case, the amount of oil supplied by the pump for lubrication will depend on the position of the eccentric relative to the protrusion on the plunger shaft, and in this example, the amount of oil supplied by the pump is controlled.

Affordable DIY solutions

Funny Pencil Reasons for oil leakage from the oil pump of the chainsaw.

Except for mechanical damage to the oil tank and oil supply system, there are not many reasons for oil leakage.

• Loose connection of the supply oil line with the inlet of the oil pump of the chainsaw and poor tightness between the hole of the oil tank and the line.
• Technical compliance with the dimensions of the plunger and the discharge chamber of the oil pump.
• Loose connection between the supply line and the oil pump outlet to the saw chain lubrication point.
• Violation of the tightness of the plunger chamber of the oil pump.

I will dwell on the last option in more detail, since it is in the event of a loss of tightness of the plunger chamber that oil leaks, and in saw structures, where the oil tank is located above the oil pump, oil flows out after a couple of days of idle time of the chainsaw.

Eliminate oil leakage from the chainsaw oil pump it is possible and all this happens quickly, if someone is good at a screwdriver and wrenches. If your chainsaw has passed a small working resource, then the problem is solved simply.

As I mentioned earlier, the guarantee of the trouble-free operation of your chainsaw is ensured not only by observing optimal operating conditions for it and using the manufacturer’s recommendations, it is also ensured by the appropriate quality of component parts, but most of all by the most high-quality assembly.

Let the part be manufactured on high-precision equipment, but when it is installed incorrectly or does not fix it with the appropriate effort, then the promised warranty from the manufacturer will disappoint you.

Like plunger type oil pump, installed on most models of budget chainsaws, simple in design. The principle of its operation does not differ from the operation of some plunger oil pumps of other categories of chainsaws.

I will briefly describe in my own words the principle of operation of a plunger-type oil pump of similar models, so that it would be a little clearer when familiarizing myself with my method of correcting oil leaks through the oil pump of a chainsaw.

Chainsaw plunger oil pump malfunctions and their elimination.

It often happens that oil is not supplied to the saw chain, even when the adjusting screw is in maximum oil supply. There are not many reasons:

• After disassembling the oil pump, the adjusting screw is set at 180 ° relative to its original position.

It is enough to reposition the adjusting screw or leave it that way. Then the screw positions for maximum and minimum oil supply () will be reversed.

• The profile surface of the annular ledge is worn out and no longer looks like a profile, but flat. The plunger does not move along its axis.

We change the oil pump or form a profile and sharpen the central protrusion at the end of the plunger shaft. In this case, the volume of the pump working chamber will slightly increase.

When adjusting the profile and the protrusion, it is necessary to maintain the same maximum dimensions in height relative to each other, so that when the adjusting screw is in the minimum mode, the plunger slightly pumps oil. The new pump has a central protrusion at the end of the plunger shaft about 0.3. 0.6 mm higher than the level of the annular profile, and in the position of the adjusting screw with a minimum oil supply, the oil pump does not work.

• Wear on the inner surface of the pump plunger chamber and the outer surface of the plunger.

This, usually, manifests itself with a previous defect or with what I will describe next. We change the oil pump or sort out the sets according to the size of the used one.

• Violation of the tightness of the working plunger chamber.

A little oil can be supplied to the lubrication point, but there is a lot of oil on the saw casing on the chain drive side.

The last example speaks of the plunger collar, which in many cases is installed in the opposite direction, with the collar outward. Some masters claimed that this is a cuff that captures oil into the pump chamber. But how does this cuff behave when inflated? Pass oil through itself?

Some people choose rubber rings instead of him, but believe me, this is not easy and very caring for the inexperienced. This method is good, but the tightness of the O-ring must be considered. If the ring sits tightly in place, then it will be necessary to replace the plunger spring, and there will also be increased wear of the mating unit of the adjusting screw and the plunger shaft. The wear of the plastic hub of the pump drive worm pair will also be added.

The ease of movement of the plunger is maintained by the use of a cuff that does not interfere with the return stroke at the moment the plunger is seized by oil and maintains sufficient tightness of the working chamber when oil is pumped.

At the first opportunity, at the chainsaws that come to me, I always disassemble the oil pump in order to be completely sure of the condition of the plunger and its cuff. In the case when the cuff is installed with the collar outward, then I reinstall it on the contrary, with the collar towards the working plunger chamber of the oil pump.

This is my method, which always justifies itself, provided that no one interfered with the design of the oil pump and the oil was supplied to the pump through the oil filter.

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Educational program: chainsaw oil pump.

I am starting a column called “Educational program” in which I will talk about the details and units of chainsaws, their design, the reasons for the failure and the methods of repair.

The oil pump opens this heading. The oil pump in the chainsaw is required to lubricate the saw chain during operation. In most cases, a plunger-type oil pump is installed. The oil pump is located under the clutch.

Chainsaw oil pump device:

To get to it, you need to remove the clutch (the whole process can be seen in detail at. Thanks to the author. Evgeny Kravchenko for a detailed story!).

This is what the oil pump looks like after shooting the clutch:

The figure shows very clearly the plunger, which has a groove on the tail. This groove is needed to capture the required portion of the oil and feed it through the hose to the guide bar and further to the chain. Rotation of the plunger is provided by the sprocket of the clutch drum. Accordingly, we get the required amount of oil at any engine speed, since engine speed and plunger speed are interrelated.

Plunger Stihl MS 210,230,250

Many chainsaws have the ability to adjust the amount of oil supplied. Adjustment is made by turning a screw, which decreases or increases the amount of oil that is captured by the plunger. The screw is located underneath the pump. (cm.).

Variable oil pump

Chainsaw oil pump and lubrication system malfunctions:

• The most common reason why chain oil stops flowing is clogged output channel. In this case, you just need to blow through the channels. Channels can also be clogged on the bus. Also easy to clean.
• Oil leaks during standstill. There are several possible reasons: 1. Cracks in the oil pump housing. 2. Check the integrity of the hoses and their attachment.
• Insufficient chain lubrication. As already mentioned above, on some chainsaws, you can adjust the amount of oil supplied. If there is no such adjustment, then again there are several reasons. 1. Air leaks cracks in the hoses, pump casing, or hose attachment points. 2. On the drive of the oil pump, the loops are worn out. In that case, a replacement. This also applies to the plunger.
• High oil consumption. This malfunction may occur due to: 1. Incorrectly installed tire 2. Failure of the oil pump. In fairness, it is worth noting that many chainsaws have a large oil consumption for chain lubrication by nature. Its consumption can be reduced by using specialized oils for lubricating chains.

Diagnostics and repair of the oil pump and chainsaw chain lubrication system