Belarus has always been famous for its powerful special equipment. But for some reason, many associate this country with Belaz. Although this is far from the only special equipment that is produced in Belarus. One of the largest manufacturers of commercial vehicles is MAZ. This enterprise produces a wide variety of equipment - from military to truck tractors. MAZ also produces special equipment. One of the most popular is the MAZ-5551 dump truck. The car began to be produced in the USSR. Its production is still ongoing. What is MAZ-5551? Specifications, photos and review are further in our article.
Appearance
This truck replaced the MAZ 5549 dump truck. The main difference in appearance is the cab. The previous generation of dump trucks used a cab with rounded shapes. This MAZ received the nickname “tadpole”. Since 1985, the new MAZ-5551 was released, which received the following appearance:
The cabin has become more square. The windshield is now solid, without any partitions. The design and shape of the head optics have also been improved. Now it is located in an iron bumper. The turn signals and side lights are combined together and are located on the black radiator grille. For manual cleaning of glass, a small step is provided in the bumper. Since the cabin is high, it is simply impossible to climb onto the MAZ and wash the windshield without it. By the way, as many as three wipers were used in this cabin for the first time. But judging by the reviews, they do not work effectively. The wipers do not cover the glass area well and leave a lot of dirty areas behind. The door handle is still metal. It also has an integrated lock. A footrest is provided for ease of entry. The body of the MAZ-5551 had different cubic capacity depending on the modification (we will look at this a little later). But regardless of the type, the dump truck was always equipped with a hydraulic drive. The large cylinder raised the platform to a fairly large angle.
How to raise the cabin of a MAZ dump truck correctly?
First of all, move the gear shift lever to neutral. Then remove the cable from the pin and open the trim. Pay attention to the special handle with which you can open the locking mechanism. This handle is installed in the sleeve and moves down until it stops.
Before raising the cab on the MAZ, turn the distributor handle to the “Lift” position. Use this mechanism located in the hole in the pump drive shaft to activate it.
The pump allows the unit to be lifted completely. It reaches an unstable equilibrium and then tips over spontaneously. If you are performing this procedure for the first time, it would be useful to watch a video on how to raise the cab on a MAZ.
Do not forget about the important rules that must be followed:
- When lifting or lowering, you must not be in front of it;
- Before you start tipping, you should check the doors (do not forget to close all mechanisms);
- There should not be any loose objects in the cabin that, if dropped, could damage the elements;
- Lower the cabin by turning the corresponding handle to the “Lowering” position. The locking mechanism is activated automatically in the lowest position. After this, the cable must be put on the axle on the cabin.
Any repair or maintenance work on the engine must be carried out only with the mechanism fully raised. Therefore, the driver of such a vehicle must know how to raise the cab on a MAZ.
Changes after 1995
In the mid-90s, the Minsk Automobile Plant modified the cabin for the Belarusian dump truck. Thus, a larger radiator grille with a proud “MAZ” emblem appeared in front, and more “gills” were located on the sides to direct air flow. These elements are necessary to ensure that dirt does not accumulate on the side of the cab when driving.
Under the influence of directed flows, the blanket simply flew off the surface. The shape of the bumper has also changed. It was still made of metal, but the optics became larger. The turn signals and side lights also moved down. On some models, the dimensions are duplicated in the upper part of the cabin. The windshield remains the same size. The number of rear-view mirrors has increased. This contributed to better visibility - reviews say.
Pneumatic distribution valve for hydraulic lift
The pneumatic distribution valve is used to remotely control the lifting mechanism using compressed air. The tap is mounted on the bumper reinforcement, and its handle is located in the cabin on the instrument panel.
One of the features of Belarusian-made vehicles is a cab that tilts in relation to the front ball joints.
The modern mechanism allows access to the engine and steering systems. The same applies to other units that are located in the front of the chassis.
Body and corrosion
How well is the MAZ body protected from corrosion? Reviews say that metal is very afraid of moisture. Bugs and swellings very quickly form under the paint, which then develop into through holes. As reviews note, the cabins of the first samples were painted to a higher quality. However, after the collapse of the USSR, the quality of painting and the metal itself noticeably deteriorated. There are many examples whose cabins are rotten to the ground. Therefore, owners will have to regularly treat the metal with protective agents in order to prevent the further spread of corrosion. What is noteworthy is that the frame and body do not rot so often. However, the thickness of the metal here is completely different.
Dimensions, ground clearance
MAZ-5551 is one of the most compact dump trucks in the line. So, its length is 5.99 meters, width - 2.55 (including mirrors), height - 3 meters at cabin level. The wheelbase of the car is only 3.3 meters. But the ground clearance is considerable - almost 30 centimeters. Any repair work can be carried out in the absence of a lift and inspection hole. Getting to the axles, driveshaft and other components is quite easy. Such a high ground clearance has a positive effect on cross-country ability. The machine can be operated without problems on roads without asphalt surfaces, as well as on sandy terrain.
MAZ 5551 2 doors. dump truck, 180 hp, 5 manual transmission, 1988 - the car tilts to one side
contents .. 984 985 986 ..Why the car tilts to one side: reasons
Sticking of struts, springs and shock absorbers
The racks keep the car body suspended above the wheels. They help transfer the weight of the car to the wheels. The struts include shock absorbers that absorb shock from road imperfections and provide a smooth ride. Shock absorbers absorb shocks thanks to coil springs. These three components (coil springs, shock absorbers and struts located on one side) can become stuck. As a result, one side can no longer move up and down and is stuck in an intermediate position higher or lower than the other.
Deformations in the suspension and chassis
The suspension and chassis are the two largest and most important parts of a car and form its foundation. When deformations and bends occur in one of them, the car frame loses strength and balance, and therefore tilts to the side.
Tire parameter difference
A fully inflated tire has a higher height than a deflated one. Therefore, a car with fully inflated tires is higher than one with deflated tires. If one or two of a car's tires are flat while the others are fully inflated, the car may roll to one side. Additionally, if one or two tires are a different size than the rest of the tires, you will also see significant roll.
Why does the right side sags?
The presence of a car roll is determined on a flat surface. The first thing you should do is check the tire pressure and inflate all four wheels to the same level. Further, a common cause of tilt is uneven wear of the springs. If, when carrying passengers, the right side of the cabin is constantly loaded more than the left, over time this leads to a loss of spring stiffness on the right side. Experienced motorists advise swapping the springs on the right and left sides of the car. After some time the roll will disappear.
The subsidence of the right side is also caused by the failure of the rubber bushing of the rear right shock absorber or deformation of the upper parts of its mounting.
The car tilts to the left
When there is only one driver in the cabin and the car is on the parking brake, the left side is slightly tilted. This position is maintained when the driver leaves the car. The hand brake prevents the wheels from turning and aligning both sides. When the handbrake is lowered, the tilt disappears. A malfunction of the left ball joint and failure of the tie rod ends are also the cause of the roll to the left side.
Large roll when turning
Factors influencing the tilt of the car when turning are: -quality of rubber; -springs; -anti-roll bar; - shock absorbers; - center of gravity and center of tilt of the vehicle.
Springs of optimal stiffness paired with shock absorbers that can control it will help to avoid large roll when cornering. Stabilizers control movement when turning. The stiffer they are, the less roll. Rigidity depends on the thickness of the stabilizer. The machine has the smallest tilt when the center of gravity coincides with the center of roll. It is determined by the suspension geometry. When the suspension is lowered, the center of gravity lowers and the lean when turning decreases. Tilt of the car can be a plus if all wheels have good grip on the road. Negative consequences are expressed in uneven tire wear and changes in wheel alignment angles.
How to troubleshoot
The mechanic will be able to determine what the problem is by determining the nature of the roll. However, he often checks the condition of the suspension, chassis, springs, shock absorbers and struts, since in some cases there may be several reasons for the occurrence of roll.
Some faults (compressed springs, flat tires) can be eliminated by repair, while others will require replacement of failed elements. Finding serious damage to the chassis or suspension means costly repairs are required.
Why is troubleshooting important?
A vehicle that is tilting has a problem with the shock absorbers, springs, struts, chassis, or suspension. All of these elements are important and their failures cannot be ignored. Continuing to drive the vehicle while it is tilting to one side may cause further damage to these components. Even if the initial problem is minor, if there is no quick response, it can develop into a serious one.
Specifications
Technical characteristics of MAZ 5551 in a 2-door body. dump truck with 180 hp engine, 5-speed manual transmission, produced since 1988.
Basic data
- Start of production:
unknown - End of production:
in production
- Body:
2 doors dump truck
Engine
- Fuel grade: Diesel fuel
- Engine capacity, cubic meters see: 11150
- Power, hp: 180
- Torque, Nm/rev. per minute: 667
- Maximum speed, km/h: 83
- Power system: Diesel
- Cylinder diameter, mm: 130
- Piston stroke, mm: 140
- Compression ratio: 16.5
Drive unit
- Drive type: Rear
Transmission
- Transmission: Manual
- Number of steps: 5
Other
- Fuel tank volume, l: 200
contents .. 984 985 986 ..
Modifications
This truck model is offered in several modifications:
- 555102-220. This is a construction version of MAZ. The car is equipped with an all-metal platform with a rectangular cross-section. Body volume ranges from 5.5 to 8 cubic meters. The maximum lift angle is 50 degrees.
- 555102-225. This is a MAZ agricultural vehicle. The car has a rectangular body with a volume of 5.5 cubic meters. This volume can be expanded to 7.7 thanks to the extension sides. The body, unlike the previous version, has a three-way unloading. The maximum permissible lifting angle is 47 degrees.
In the cockpit
Getting into the car is carried out thanks to several steps and metal handrails. Inside, the interior is ascetic, but in those years they did not pursue newfangled design. The driver's workplace is organized simply and without frills. So, there is a large two-spoke steering wheel with height adjustment, as well as a flat seat without a headrest. According to reviews, you feel tired while driving a MAZ after the first hours of work. The car is very noisy, the suspension reacts harshly to bumps, and you always have to grasp the steering wheel. The gears do not start the first time. By the way, the truck has different types of gearboxes with different numbers of gears. To avoid confusion, a special diagram is provided for the driver. MAZ-5551 has a sticker with information about which gear is in which position of the lever.
The instrument panel is completely analog, with a set of several buttons. They turn on with a characteristic click. There is a separate row for warning lamps in MAZ. All of them are located at the top, above the dials. The pedal assembly is not very conveniently arranged, but you can get used to it. By the way, this MAZ uses two floor pedals. One is the brake, the second is the accelerator.
What pleases us in the cockpit is the good visibility, which is achieved thanks to the captain's seat. However, additional mirrors for versions before 95 would not hurt.
Unlike other trucks from the Belarusian manufacturer, the cabin of the MAZ 5551 model does not have a berth. However, a sleeping shelf is not needed here. After all, the car is not designed for long-distance driving.
Dump trucks MAZ 6501B5, 6501B8, 6501B9. Guide - part 4
—engage 3rd gear (or any other from the lower speed range, except reverse)
travel), and without releasing the clutch pedal, turn the lift control switch to the “ Lift”
»;
— smoothly release the clutch pedal, simultaneously increasing engine speed. By
The tachometer should maintain engine speed within 1200–1500 rpm
-1
.
When the last cylinder tube extends approximately 2/3 of its length, turn off
clutch, disengage the gear and turn the platform control switch to the neutral position. In this case, the platform should stop.
To lower an empty platform: — turn the switch handle to the extreme left position – “ Lowering
"; —after the platform is completely lowered, move the switch handle to the neutral position
living;
—turn off switch 22 (Figure 4); If it is necessary to stop the platform in an intermediate position during the process
lifting or lowering, simply press the clutch pedal, disengage the gear and turn the platform control switch to the neutral position.
4.3.5 Maintenance of the platform and vehicle platform lifting mechanism -
dump truck and tipper road train
Rules for the operation and maintenance of a dump trailer as part of a road train due to
included in the trailer's owner's manual.
When operating the platform lifting mechanism, the following rules must be observed: 1 To avoid accidents, if it is necessary to work under the platform,
when falling, secure the platform with a folding safety stop (the presence of cargo in the platform is unacceptable).
2 Do not overload the dump truck and road train in excess of the established norm and ensure equal
measured distribution of cargo across the platform, avoiding overloading the front part.
3 Regularly lubricate all joints and assemblies in accordance with chemmotological
map.
4 Monitor and promptly tighten connections of oil lines, air lines and
hoses, preventing oil and air leaks.
5 Monitor the oil level in the tank. When the oil level drops below the second mark on the indicator,
Leaving the level, add oil to the upper mark. The added oil must be carefully filtered.
6 Change the oil in the hydraulic system after the first 500 lifts of the platform. Further
Change the oil based on the chemotological chart.
At each oil change, wash the filter in diesel fuel and blow with compressed air.
main elements of the tank oil filter.
To change the oil, unscrew the plug in the tank, as well as the filler cap of the oil tank.
After draining the used oil, close the drain plug in the tank and fill the tank with fresh, carefully filtered oil.
To quickly drain the oil from the oil tank, it is necessary to disconnect the suction
hose from the pump connection and drain the oil into a container.
It must be borne in mind that contaminated oil is the main cause of premature
temporary wear and malfunction of the lifting mechanism components and especially the pump.
The high pressure pump is sensitive to overloads and the purity of the oil used.
When adding and changing oil, it is necessary to carefully filter it, preventing foreign impurities and water from entering the tank.
If it is necessary to disassemble the pump, care must be taken not to interfere with
Replace the gear bushings.
To avoid premature failure of the pump, it is strictly prohibited to use
use in the hydraulic system of types of oils not provided for in the chemical chart.
During operation of the hydraulic cylinder, it may be necessary to disassemble it.
for replacing sealing collars (rings) or guide half-rings and sleeves. For this
Specifications
Like other MAZs, units from the Yaroslavl Motor Plant are used here. Initially, this dump truck was equipped with a V-shaped six-cylinder unit without a turbine producing 180 horsepower. The engine displacement is 11.15 liters. Despite the low power, the engine had acceptable thrust. And as you know, for a truck the torque indicator comes first. Here it was 667 Nm at 1200 rpm. In the 2000s, the line was replenished with new power plants. Thus, MAZ was equipped with a YaMZ-236NE2 engine. This is an engine that complies with Euro 2 standards. With the same volume of 11.15 liters, it developed a power of 230 horsepower. Torque increased to 882 Nm. The layout remains unchanged - V-shaped six.
In rare cases, a turbocharged engine from YaMZ was installed on a dump truck. This engine complies with Euro-Z standards and develops a power of 250 horsepower. Torque is as much as 1128 Nm at 1100 rpm.
An American-made Cummins engine recently appeared on the MAZ-5551. This engine develops power of 242 horsepower with a volume of 6.7 liters. The engine is equipped with a turbine and a charge air cooling system. As for gearboxes, depending on the modification on this MAZ one could find:
- Five-speed manual transmission.
- Eight-speed manual transmission with divider.
- Nine-speed manual transmission.
The latest box was developed jointly with the German concern ZF. How about MAZ boxes caused much more problems than imported ones. This is facilitated not only by time, but also by the resource, which decreases every year for these transmissions. MAN gearboxes and gearboxes from ZF are the most reliable and problem-free.
Cab tilt cylinder: easy cab lifting and lowering
Cars with a cabover cab have an important auxiliary system - a tipping mechanism with a hydraulic cylinder as a power element. Read everything about the cylinders of the cab tilting mechanism, their existing types and designs, as well as their correct selection and replacement in this article.
What is a cab tilt cylinder?
The cab tilting mechanism cylinder (MOK cylinder, MOK hydraulic cylinder) is an actuator for the cab tilting mechanism of trucks with a cabover layout; Double-acting hydraulic cylinder for raising and lowering the cab.
The MOK cylinder has several functions:
- Raising the cabin for maintenance or repair of the engine and other systems;
- Assists the balancing mechanism in supporting the cab in an inverted position;
- Smooth lowering of the cabin without jolts or jerks.
This hydraulic cylinder is part of the cab tilting mechanism (the system in some cars is combined with a spare wheel lifting mechanism), which consists of a manual oil pump, two pipelines, a reservoir for working fluid and, in fact, the MOK cylinder.
Performance characteristics
What is the consumption of this car? MAZ-5551 is a fairly economical car. Despite the high displacement, YaMZ engines consume about 23-25 liters of fuel. Even in the most severe conditions, this consumption never exceeded 28 liters. If more, it means the car had significant fuel problems. By the way, the injection pump on the MAZ-5551 is mechanical. Acceleration to 60 kilometers per hour takes about 50 seconds. The maximum speed of the MAZ-5551 is 85 kilometers per hour.
Position of the dump truck on the market and its price
As mentioned above, production of the MAZ 5551 began in 1988.
The first model was less comfortable for the driver and not as functional. In 1998, a new, improved model appeared on the market, which became more popular among consumers. The main changes affected the design of the cabin and instrument panel. The cabin has become more spacious and can accommodate two passengers. In addition, it can recline, which makes troubleshooting and repair much easier.
In the modern market, this model of dump truck is famous for its high level of reliability and is universal, therefore, the demand for the truck is increasing every year.
As a rule, many buyers are interested in used trucks; only large-scale enterprises can buy new cars. When choosing one option or another, it is worth keeping in mind that price is not the main indicator of quality.
When choosing a dump truck, you should pay attention to the condition of the frame, engine, body and other important components. Those who want to save money can purchase older models and then purchase new components for them. There should be no problems with repairs, because there are plenty of parts for MAZs on the market, and its design itself is quite simple.
Chassis
The design of the frame and suspension has not changed since the days of the “tadpole”. So, a pivot beam is used at the front, and a continuous bridge at the rear. The suspension is fully dependent, without a front anti-roll bar (it is located only at the rear). The frame itself is of a ladder configuration and is made of high-strength steel. This is where the body, cabin, engine and gearbox, as well as all suspension elements are attached. The rear axle (also known as the final drive) is without differential locking, with a gear ratio of 7.79. The bridge is not high-speed and is designed for high traction.
Over time, it begins to emit a characteristic hum. The oil seal coming from the crankshaft may also be squeezed out. As for the springs, they are practically eternal. The suspension is quite reliable and unpretentious in terms of maintenance (once a year you only need to lubricate the front pins). Steering wheel - with gearbox and hydraulic booster. Steering play is a common thing for MAZ. A similar dump truck from KamAZ has the same “disease”.
The cabin of the MAZ 5440 does not rise, what should I do?
Guys, give feedback and help with the choice, thanks in advance. View all images
Sergey (Jerry) what are the differences between 323 and 329?
Sergey (Jerry) Sergey, different years of production. Maz 54323 is probably from 1990, and Maz 54329 is from 1988.
Fanis (Marceline) heard good reviews about 5440 (if Euro 2) the cabin is larger and more comfortable and the cushions are good, plus a low saddle
Sergey (Jerry) the pictures do not correspond to the factory models - that's for sure! in the nineties they made an unsprung cabin. and they certainly didn’t think about Euro hubs! Therefore, if the question is which one to take, then you need to look at what is crammed into them! Maz with a square cabin is such an interesting design, what hasn’t been altered in it: - rigid or sprung cabin - engines 236, 238, 7511 - atmospheric, turbo, turbo intercoolers - front spring multi-leaf, small-leaf - crown small, large or finally euro hub - gearbox 5-speed, 8-speed, zf-16 - final drive short or long - saddle high or average there are a lot of other little things that happen, if the MAZ is used then an individual approach is needed, because each owner makes the car for himself. I heard a lot of negative things about the first 5440, but over time the reviews changed to positive ones
I like a square sprung cabin with a ceiling from 5440 (a high roof is obtained), engine 238 turbo intercooler (330 hp), 5-speed gearbox, man clutch, leaf springs in front, air in rear, small crowns or Euro hubs, two huge tanks, receivers in frame hidden
Sergey (Jerry) Fanis, thank you
Sergey (Jerry) Sergey, thank you
Sergey (Jerry) And why don’t you want 54327, it’s the one that has a backside in the air, it all depends on what you need the grease for - for long-distance, of course, it’s better than Eureka, but if you’re climbing around construction sites, then you can use 54329. As for the turbine, if you run the car on the plain then nah it’s unnecessary!
Zenfira (Hyousuke) MAZ 54323 engine turbo 300 hp gearbox 8 speed MAZ54329 engine without turbo 240 hp gearbox 5 speed it is simpler and more reliable
Rustam (Aikaterine) maz 8 with 5 tbsp complete shit
Alexey (Rosabel) they have different engines and gearboxes
Dmitry (Indrabha) guys, tell me about the Maza5440 engine 7511 2005, how and what kind of car it is, what problems it has or should not be taken
Sergey (Jerry) Dmitry, so much time has passed... if you took it, then tell us how it was used. In general, my dispatch center periodically sends such a machine. the owner is an old guy I know. I bought this car from scratch a year and a half ago. doesn't work much on it.
There is not a lot of work in the city; for intercity work the rate is not always suitable. told me that when he took a car, he was offered different engines: Man, Mercedes, Cummins. he preferred 7511 only because it is still native. spare parts can be found in stock and they will be cheaper than imported ones.
400 horses, ZF gearbox 8 or 9 gears, I don’t remember anymore. The box is from China, over time they say it starts to fall apart... but this one is fine, because it doesn’t load more than 10 tons. he doesn’t pull the cart, although the amount of work would immediately increase... but he says that these are not the years to drag the cart.
all the problems that he had with this car - some kind of microcircuit responsible for the oil pressure arrow (constantly showed 8 kg), it was brought under warranty for two months. The battery was stolen twice, the on-board computer was stolen once (everything was paid for by insurance). I tore the awning, I was too lazy to tie it properly.
Otherwise there are no problems with the car.
Dmitry (Indrabha) Sergey, thank you very much for the information
Alexander (Ward) the worst problem with the 7511 is a bursting block, a crack occurs in the area of the starter, it can be treated by replacing the block, which is not currently produced, you need to look for a used one.
and if everything is adjusted, everything is fine, everything works, any foreigner will give a head start both uphill and downhill, sometimes they carried 25-30 tons of dragging, no matter what. passed 600 thousand. sold.
MAZ-5551 – price
The oldest models, produced back in Soviet times, can be found for 150-200 thousand rubles. These are dump trucks with a YaMZ-236 engine and a five-speed transmission. Models produced in the 2000s can be found at prices ranging from 500 to 800 thousand rubles. It is not worth purchasing very old models.
Many of them have already exhausted their service life, and the owner will invest all the profits only in spare parts.
