Tips & Tricks

Claas Front axle drive shafts

Warning, danger to life!!!

In the first cut of the 2022 season, a steep slope had to be harvested. The machine was chopping downhill when, for no apparent reason, it suddenly picked up ground speed rapidly. The reflexive stepping on the brake pedal only caused the machine to yaw to the left, but there was no noticeable braking deceleration despite the all-wheel drive being switched on. As a last resort, the driver quickly turned the steering wheel to the left in order to bring the machine, which fortunately stopped despite the relatively high speed, to a halt across the slope. At the time in question, the tractor with trailer was to the right of the chopper, otherwise a collision would have happened here as well. The reason for this behavior: A broken right drive shaft on the front axle!

Therefore, the urgent advice to all owners of such a Claas axle is to check the drive shafts in your own interest with a "crack detection spray"!

All Mengele SF 6 and SF 7, Claas 690 to Jaguar 800 (Type 490), all Claas Dominator/ Mega and the Case "CF" machines are affected!

This list does not claim to be complete!


Repair of panels for fan- and cutting-houses

It happens again and again that we come across fan and drum panels that have been "repaired" by some previous owner. The panel on the left is a classic example: From the outside it looks absolutely flawless. The "repair" is even so well done that it is not immediately recognizable as such (click on the picture).

On the inside, all the horror comes to light: A metal sheet was simply welded over the worn-out original casing sheet from the outside. The original sheet metal was not cut out. The result: Razor-sharp metal plates gradually detach from the worn original metal plate, which then end up in the feed and then cut open the esophagus and stomach of your animals from the inside.

With such a cover plate you put your animals in danger!

Therefore, check all your drum and fan bases, such work has also been seen on fan housings!

This recommendation applies to forage harvesters of all types and manufacturers. We always have all panel plates in stock, these are available at short notice.

For third-party products, we have panels plates on request.


Lubrication of bevel gears Mengele headers

The bevel gears for driving the individual intake chains are fitted with bearings that have to be lubricated once a year using lubricating nipples.

These grease nipples are very inconvenient to reach under the machine.

As an improvement, a lubricating bar was attached to the left side of the machine on this MG 43Z and lubricating lines were laid to the said lubricating points so that they can now be lubricated very easily from the outside.

Wear plates cracker housing SF 6

In the cracker channel of the SF 6 series, there are no wear plates installed on the inside, which means that there is a considerable amount of repair work to be done in the event of advanced wear.

In order to avoid this effort from the outset, exchangeable metal sheets were attached into this channel, which can be easily changed if necessary.

The position of the upper fastening screws must be chosen well, so that they do not collide with the external tension springs of the upper crushing roller!

Optimized crop flow at PU 3000

In order to make the flow of forage from the pick-up to the chopping unit more constant, the corners of the outlet chute were smoothed out on this pick-up. The forage no longer has to change direction once by 90°, but only once by 30° and then by 60°. The result is a more even feeding of the chopper.

Passenger seat at SF 6

Here is an example of a relatively simple passenger seat that you can build yourself: A plastic plate was attached to the rear wall of the cabin using two sturdy hinges, which can be folded up using compression springs. A piece of flat iron attached to the door frame serves as a stop when folded down. Since the space in the cabin is relatively cramped at this point, the driver's seat was moved about 30mm to the right.

Filling quantities of air conditions

The specified values do not correspond to the official specification, but have nevertheless proven to be a good fit in practice.

SF 6 series: 1.4 kg

SF 7 series: 1.9 kg

R 134a is used as the refrigerant.

Cardan shafts for 4-wheel drive

By chance it was discovered that the wedge profile of a cardan shaft could only be moved with an extremely high expenditure of force.

The cause turned out to be moisture that had penetrated, which caused corrosion on the wedge profile despite the existing lubrication-film.

A wedge profile that does not move smoothly can cause very expensive repairs to the front axle output gear or the rear axle differential!

It is therefore recommended to unflange the cardan shafts of your machines on one side and to check the ease of movement of the wedge profile!

All choppers from all manufacturers that have mechanical 4-wheel drive could be affected by this problem.

Hydraulic cylinder main drive SF 6

Lately there have been frequent machine failures with the SF 6 due to the hydraulic cylinders 02-064 999 actuating the main drive idler. All machines had between 4,000 and 4,500 operating hours on the meter.
It is recommended to replace this cylinder with appropriate number of hours as a precaution!

Setting of assembly carriage limiters at chopping unit

Due to several inquiries regarding the correct setting dimension of these stops, which limit the lowering of the chopping-unit downwards, their function should be briefly illustrated using a sketch (click on the sketch).
Ultimately, these stops set the "discharge angle" of the cutting cylinder. If the "X dimension" of these stops is too short, the cylinder does not throw directly into the blower but upwards onto the grass chute.
This creates a certain "ping-pong effect" that can occasionally clog the machine.
Please pay attention to signs of wear on the inner-top of the grass shaft, these are clear indications!
In machines with 800/65-32 front axle tires, there is also the problem that the pick-up is relatively steep downwards, because the unit may only lower to a certain position due to the angle of discharge. As a result, the feed flow at the transition from the pick-up to the chopping unit becomes somewhat unconstant.
Two practitioners report, that shortening the cylinder base panel by about 2 cm on the outlet side brought about a significant improvement.
Due to this shortening, a further lowering of the chopping unit can then be permitted, so that a smooth feed flow is ensured at all transitions.
If you only have one single chopper unit for your machine, the procurement of two different drum bases could be a solution: one for corn, one for grass.

Slide rings upper intake rollers

The two upper intake rollers are each provided with slide rings on the left and right, which are intended to reduce the wear on the guides of the chopping unit frame.
Due to food residues and rust, these are often no longer movable and can so not fulfill their actual task.
It is recommended to test and restore the smooth running of these rings. If there are very strong traces of wear, these rings must be replaced to prevent further damage (click on the pictures).

Additional roller crop press on PU 3000

In the PU 3000 shown below, a second, smaller roller was installed behind the large hold-down roller in order to further optimize the forage flow.

The arrangement of this roller is adjustable, but not freely movable.

Protective plate with perforated grid at blower SF 6

In one specific case, a rat crawled through the air intake opening on the right-hand side of the blower into the blower or cracker-housing, could not get out and finally starved to death inside.

In order not to have to experience such an unpleasant surprise a second time when cleaning the machine, a perforated plate was welded to the front of the original mudguard in front of the air intake opening. The back was intentionally left open, since a rat cannot climb in here anyway and the air supply to the blower must still be ensured.

Lubrication of main drive chain MG 41, MG 42 and MG 43 Z

The main drive chain of the four-row maize header is very uncomfortable to lubricate while the header is attached to the harvester.

This circumstance can be greatly improved without much effort by attaching a hose to the right side of the rear wall and simply inserting it through a hole in the chain guard.

So you can simply pour oil onto the chain from above while the header is running, without having to get close to the circulating chain.

Sun blind rear window SF 6

In the late afternoon hours it gets very hot in the cabin of the SF 6 machines, as a result of strong sunlight coming through the rear window.

An air conditioning system on some machines cools the driver cabin significantly, but the radiant heat on the back is still relatively uncomfortable.

A sun blind, which can be quickly pulled down and rolled up again, offers a significant improvement in comfort.

Such blinds can be found on the Internet for relatively little money and significantly increase driving comfort even on machines without air conditioning.