Category: KAMAZ
- Device and principle of operation
- How to replace the king pin on a KamAZ
- How to knock out a king pin
- Jack
- Sledgehammer
- Assembly of the unit
Many truck owners are wondering how to knock out the kingpin on a KamAZ? The kingpin serves to connect the front beam of the truck with the steering knuckle. During vehicle operation, steering parts are subject to high loads. This leads to their wear and the need to replace them with new components.
Device and principle of operation
The kingpin is a cylindrical rod made of high-strength steel. A specialized groove is made on its surface. When installing, the groove coincides with the holes on the steering knuckle and the king pin is secured with a wedge. This prevents it from moving along its axis.
The length of the rod is 232 millimeters, diameter – 45 mm. The steering knuckle rotates freely along the axis of the rod, which is rigidly mounted in the eye of the front beam of a KamAZ truck. Bronze bushings are installed in the eyes. This reduces friction and wear of components when using the car.
The bushings have holes; they are designed to lubricate the hinge. Injection is carried out through specialized grease fittings installed in the steering knuckle. The lugs are covered with dustproof covers. They protect the hinge from dust and water while the car is moving. The top cover is equipped with a valve to remove excess lubricant during injection.
ATTENTION: It is necessary to tighten the king pin on a KamAZ truck regularly. Failure to comply with this rule will lead to contamination of the unit and rapid wear.
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One of the most important structural elements in KamAZ is the king pin. It connects the front wheel beam and the steering knuckle. The functions of a device such as a kingpin on a KamAZ 6520 are to safely turn the steering wheel and ensure maneuverability of the vehicle within the limits of its movement.
Previously, this element was used exclusively as a rotary connection not only on trucks, but also on passenger cars. To date, its use is justified only in freight transport.
How to replace the king pin on a KamAZ
Signs of the need to replace the kingpin are:
- The presence of play between the parts of the assembly;
- Instability of a truck on the road surface while driving;
- A dull knock in the area of the front beam;
- Uneven wear of front wheel tires.
You can change the kingpin on a KamAZ not only in specialized workshops, but also on your own. Replacing KamAZ king pins with your own hands is carried out in the following sequence:
- Set the cabin to its highest position;
- Raise the desired side of the car and remove the wheel;
- Remove the brake drum and pads;
- Unscrew the nut holding the locking wedge;
- Knock out the wedge using a hammer and a socket of the appropriate diameter. If you cannot knock out the wedge, you need to drill it with a drill with a diameter of 8 mm;
- Remove the dust caps on both sides of the steering knuckle;
- Dismantle the part.
IMPORTANT: During work, the cabin must be secured with a stop.
How to change
The pins are replaced when play appears in the steering knuckle. At the same time, the car’s wheels behave unstably, and while driving, knocking noises are heard in the front beam. This work can be done at a car service center, but most drivers replace the part themselves.
To dismantle it is necessary to raise the cabin to its extreme position, remove the wheel and caliper. After this, the steering knuckle covers are removed. You can replace the kingpins using a special tool and a 50-ton hydraulic jack, but most often a sledgehammer and attachments are used.
How to knock out
Before removing the kingpin, you need to knock out the locking wedge. It is located in the body of the fist eye. After unscrewing the retaining nut and using the attachment, they try to move it from its place with sharp blows of a sledgehammer. If this is successful, then the part continues to be knocked out. Otherwise, a hole with a diameter of 8 mm is drilled in the wedge approximately 2/3 of the way. After this, it is removed by hitting it with a sledgehammer.
It will be easier to knock out the kingpin if you heat the beam with a cutter. This operation must be carried out quickly so that the kingpin itself does not heat up. Some specialists use liquid nitrogen to cool the part - the effect is the same, but the likelihood of damaging the beam is reduced.
Assembly
Experts recommend replacing the bushings along with the king pin. In most cases, they are included in the kit along with shims. They need to be installed so that the hole on the bushing coincides with the grease fitting, otherwise it will be impossible to lubricate the parts. To prevent the bushing from rotating and moving during seating of the king pin, it is seated using a reamer.
Before installation, apply a thin layer of grease to all parts. Adjusting washers are installed between the upper eye and the beam, and the gap between them should be no more than 0.2 mm. The support bearing is placed in a seat on the lower eye of the steering knuckle.
The kingpin is assembled using a hydraulic jack, but some people use a sledgehammer.
When seating it, you need to remember that the slot at the end of the part should be on top. After the king pin has taken its place, a locking wedge is installed. It is secured with a nut. Free play is selected by simultaneously tapping the wedge and tightening the fasteners.
In a correctly assembled assembly, there is no play between the parts, and a small force must be applied to turn the fist. During operation, the connection must be periodically lubricated - this will extend its service life and ensure the safety of the vehicle.
Installing needle bearings
Before you begin replacing the kingpin on a Kamaz vehicle, you need to study in detail the adjustment diagram for needle bearings, which is shown in the figure above. The washers are installed in such a way that they are between the fastening beam and the upper eye. In this case, the distance between them should not exceed 0.2 mm. The support needle bearings are secured in this position.
Have you ever encountered broken pins? Did you contact a service station or do the replacement or repair yourself?
Jack
For dismantling, a hydraulic jack and a special device are used. You can buy it in a store, or make it yourself.
The puller is made of two metal plates, rigidly connected to each other by metal rods. There is a hole in the top plate. The top plate is installed on the fist so that the hole coincides with the seat. A hydraulic jack is installed on the bottom plate. The jack rod must be rested against the cut of the rod. As it extends, the jack rod will push the part out of its seat. You can also read about Where are the engine and frame numbers on KamAZ.
Sledgehammer
Replacing the kingpins on the KamAZ 6520, as on other models, can be done using a sledgehammer and an attachment of the required diameter. To do this, after removing the dustproof covers and wedge, a pointer is placed on the cut of the part and sharp blows are applied to it with a sledgehammer.
To make the procedure easier, you can heat the beam. Under the influence of high temperature, the eye of the beam will expand, and it will be easier to break through the king pin on the KamAZ.
REFERENCE: To prevent the rod from heating up along with the beam, heating must be carried out quickly. An oxy-fuel burner is well suited for these purposes.
The process of replacing KamAZ king pins
As part of the occurrence of play in the steering knuckle, you can carry out a process such as replacing the kingpins on a KamAZ with your own hands. You will know that the kingpins are out of order by the unstable condition of the wheels and the knocking sound in the front beam while driving. Yes, you can entrust repair work of this kind to a car service, but most drivers replace this element themselves.
To replace the kingpin on a KamAZ 6520, you must first dismantle the old part. To do this, you need to raise the cab and then remove the caliper and wheel. Then you need to remove the steering knuckle covers. Replacing the kingpins on KamAZ 65115 is carried out with a special tool and a fifty-ton jack (hydraulic). With the same success you can use tips and a sledgehammer.
To remove the king pin, you need to knock out the locking wedge. Its location is in the body of the eye of the fist. You should unscrew the retaining nut and, using a sledgehammer to help, move the locking wedge. Once it is moved, the wedge should continue to be knocked out. If you cannot move it, you need to drill an 8 mm hole two-thirds of the way. After such procedures, the wedge is removed with blows with a sledgehammer.
To make it easy to knock out the kingpin, you should heat the beam with a cutter. This procedure must occur quickly, otherwise the kingpin will heat up. Experts advise using liquid nitrogen in this case. The effect is the same, and the likelihood of damaging the beam is reduced to zero.
Assembly of the unit
Assembly of the KamAZ kingpin is carried out in the reverse order. Before pressing the part, it is necessary to install and tighten the KamAZ kingpin bushings. Broaching of bushings is carried out with specialized devices or a reamer.
IMPORTANT: When installing copper bushings, you must pay attention to the alignment of the grease holes. If installed incorrectly, injection will be impossible.
Before assembly, the parts are treated with grease. Pressing can be done using a jack or sledgehammer with an attachment. It is necessary to ensure that the groove on the part coincides with the hole for the locking wedge. After pressing, the locking wedge is installed in its place and clamped with a nut.
From the above it follows that replacing the king pins on a KamAZ truck is necessary when play is detected between the parts of the unit. Replacement can be done independently, either with or without the help of tools.
How to assemble
Professionals advise replacing the bushings along with this element when repairing kingpins on a KamAZ truck. They are usually equipped with adjusting washers. They should be mounted so that the grease fitting coincides with the hole on the bushing. Otherwise, you won't be able to lubricate the parts. The bushing will not rotate and move within the seat of the kingpin if it is seated by means of a reamer.
Before replacing the kingpin, you should study the installation diagram of the needle bearings, and also apply a layer of grease to all elements. The washers are mounted between the beam and the upper eye so that the gap between them is no more than 0.2 mm. A support bearing is installed in the seat on the lower eye of the steering knuckle.
Remember - the slot at the end of the element should be located at the top. When the king pin is installed, a locking wedge is installed using a nut. You need to select free play by simultaneously tapping the wedge and tightening the fasteners. If the assembly is assembled correctly, there will be no play between the parts. The video will show you exactly how to replace the kingpins on a KamAZ truck with your own hands.
