Hydraulic distributor p 80 DIY repair

In detail: hydraulic valve p 80 DIY repair from a real master for the site my.housecope.com.

MTZ 80 is a universal wheeled row-crop tractor, which has been produced at the Minsk Tractor Plant since 1974. The long production period of this machine is provided by a successful design and the possibility of aggregation with a large number of additional special equipment, which makes the tractor multifunctional. The joint use of a variety of equipment is due to the high-quality, reliable and high-performance hydraulic system of the agricultural unit. One of the key elements of this system is the P-80 hydraulic valve for the MTZ 80 tractor.

Also, the features of MTZ 80 include:

  • the presence of a rear-wheel drive;
  • front placement of the power unit;
  • a large number of forward and reverse gears (18/4);
  • ease of repair and maintenance.

The successful design of the tractor, its technical characteristics and versatility ensure MTZ 80 is widely used not only in agriculture, but also in production, construction, housing and communal services and forestry.

Image - Hydraulic distributor p 80 DIY repair

The hydraulic system of the tractor is designed to control and provide energy to the installed various additional equipment, which can be completed with MTZ 80. It is made in a separate-modular version and includes the following main elements:

  • gear pump;
  • power regulator;
  • hydraulic magnifier;
  • separate control cylinders;
  • hydraulic valve MTZ;
  • hinge mechanism for mounting equipment;
  • PTO;
  • high pressure tubes;
  • connecting fittings;
  • oil tank.
Video (click to play).

Despite the large number of elements and assemblies used in the hydraulic system, the design over several decades of operation has made it possible to identify the arising shortcomings in the work and, as a result of the modifications carried out, to eliminate them.

At present, the operation of the hydraulic system is characterized by high reliability and high productivity, which allows the use of the most modern attachments and trailers for the MTZ 80 tractor. An important contribution to this is made by the P80 hydraulic distributor, which, with proper maintenance and correct adjustments, practically does not require repair.

Image - Hydraulic distributor p 80 DIY repair

Distributor R-80 3/1 222G of three-section type is used in the general-purpose hydraulic system of the Belarus 80 tractor and for the following functions:

  • protects the system from hydraulic overloads during lifting or forced lowering;
  • distributes the flow of hydraulic fluid, which is pumped by the hydraulic pump between the units of the system (hydraulic cylinders, hydraulic motors, etc.);
  • unloads the system at idle with neutral development due to the overflow of transmission oil into the oil tank;
  • performs the connection of the working volume of the hydraulic cylinder for draining the process fluid (when working in the neutral position).

In addition, the hydraulic distributor P80 3/1 222G serves as a basic device on which various modifications are made for use on loading units, excavators and road construction equipment.

The technical characteristics and parameters of the distributor can be found in the description of the P80 marking, where:

  • Р - distributor.
  • 80 - nominal transmission fluid consumption (l / min).
  • 3 - version of the process pressure (maximum allowable 20 MPa, nominal 16 MPa).
  • 1 - type of operational purpose (autonomous use in general-purpose hydraulic systems).
  • 222 - three special spools made according to option two.
  • D - hydraulic locks (check valves).

The valve assembly consists of the following key parts:

  • housings Р80 3/1 222G with connectors for valves and channels for supplying process fluid from the gear pump and channels for removing oil from the cylinders;
  • three spools, which are equipped with locking and auto-return mechanisms;
  • upper housing cover with integrated guides for spool control;
  • special overflow safety valve.

The principle of operation of the hydraulic distributor is based on the fact that when the hydraulic distributor P80 3/1 222G is connected to the hydraulic system inside the body, all spools and the valve form several combined passage channels for hydraulic fluid. There are three of them in total.

  1. Discharge - Covers all spools and bypass valve.
  2. Drain - with this option, only the spools are connected, and this channel provides the release of the waste fluid.
  3. Control - also passes through all spools and an overflow valve, but at the same time is connected to the process piping from the pump.

The control of the spools, respectively, and the redirection of transmission oil flows through the appropriate channels provides four different positions when working with additional units and equipment. These operating modes include:

  • neutral,
  • rise,
  • sinking,
  • swimming position (lowering of working devices under the influence of their own weight).

Such a device allows, if necessary, to carry out repairs separately on each operating mode and connection diagram of the P80.

The most common malfunctions in the P80 3/1 222G hydraulic valve installed on the MTZ 80 tractor should be considered:

  • wear of the interface in a pair of valve body-spool;
  • violations in the piston of the hydraulic cylinder;
  • breakage of pump gears;
  • cracking of rubber seals;
  • leakage of hydraulic fluid through the connecting fittings;
  • damage to the oil drive tubes.

The design and device of the hydraulic valve allows the operator to repair these malfunctions with his own hands. In addition, a special repair kit recommended by the manufacturer for the P80 3/1 222G will help to facilitate the repair.

The reliable proven design of the P80 hydraulic valve allows it to be successfully used on a newer version of the Belarus 920 tractor, as well as on the multifunctional MTZ 3022.