Tractor hydraulic system MTZ (Minsk Tractor Plant) is the “circulatory system” of equipment, on which the operation of attachments, steering and other critical components depends. At the center of this system is hydraulic tank — a reservoir for working fluid where the filter element is installed. It protects pumps, valves and hydraulic cylinders from abrasive particles, metal shavings and oil wear products.

However, many owners MTZ-80/82, MTZ-1221, MTZ-320 and other models underestimate the importance of timely replacement of the hydraulic tank filter. A clogged or damaged filter leads to increasing the pressure in the system to 25–30 bar (at a norm of 16–18 bar for most MTZ models), which is fraught with rupture of hoses, leakage of seals and even failure of a hydraulic pump costing from 40,000 rubles. In this article we will look at how to avoid breakdowns, choose the right filter and replace it without contacting service.

Signs of a clogged MTZ hydraulic tank filter

The tractor's hydraulic system signals problems with the filter long before critical wear. The main thing is not to ignore these “symptoms”. Here are the key signs that the filter element needs to be checked or replaced:

  • 🔴 Reduced attachment performance: The plow, cultivator or loader operates jerkily and does not develop full power.
  • 🔴 Noise and vibration in the hydraulic pump when the hydraulics are turned on - a sign of cavitation due to insufficient oil flow.
  • 🔴 Overheating of hydraulic fluid (temperatures above 80°C) even under moderate loads.
  • 🔴 Oil leak from under the hydraulic tank cap or along the seals - increased pressure looks for weak points.
  • 🔴 Emergency pressure lamp lights up on the dashboard (if a sensor is installed).

Particularly dangerous false low oil level signal. The fact is that a clogged filter creates a vacuum in the hydraulic tank, and the level sensor can operate even with a normal amount of liquid. This leads to incorrect oil addition and overfilling, which aggravates the problem.

⚠️ Attention: If you hear the hydraulics metallic grinding or knock in the area of the hydraulic pump - stop the tractor immediately! This is a sign that large particles have entered the pump, causing irreversible damage.

Types of filters for the MTZ hydraulic tank: which one to choose?

Filters for hydraulic tanks MTZ vary in design, material and degree of filtration. Main types:

Filter type MTZ models Filtration degree (µm) Resource (motor hours)
Mesh (coarse) MTZ-80/82, MTZ-50 100–150 500–800
Paper (fine) MTZ-1221, MTZ-320, Belarus-2022 10–25 300–500
Magnetic (optional) All models Captures metal particles Unlimited (requires cleaning)
Combined MTZ-920, MTZ-1523 25 (paper) + 100 (mesh) 400–600

For most tractors MTZ The manufacturer recommends filters with nominal filtration fineness 25 microns. However, if the equipment is operated in highly dusty conditions (for example, during grain harvesting or in quarries), it is better to install two-stage cleaning system: mesh filter (100 microns) + paper (10 microns).

When choosing, pay attention to catalog numbers:

  • 📌 Hydraulic tank filter MTZ-80/82: original - 80.3511010-01, analogues - BFG-1 or MF-1025.
  • 📌 For MTZ-1221/1523: 1221.3511010 or HFP-30 (imported analogue).
  • 📌 Universal filters: G41-10 (suitable for many models).
⚠️ Attention: Do not buy filters from plastic case for tractors operating in frost below –20°C. The plastic becomes brittle and may burst when starting cold hydraulics.
📊 What filter is installed in your MTZ?
Original (factory)
Domestic analogue
Imported (eg Mann or Fleetguard)
I don't know, I've never changed it

Step-by-step instructions for replacing the hydraulic tank filter

Replacing the filter in the hydraulic tank MTZ - a procedure that can be performed independently in 30–60 minutes. The main thing is to follow consistency and safety rules.

Drain the hydraulic oil into a clean container|Disconnect the battery (to avoid accidental starting)|Prepare a new filter and o-ring|Have a rag and keys on hand for 17, 19, 22-->

Step 1: Drain the oil and remove the old filter

  1. Place the tractor on a level surface and turn off the engine.
  2. Place a container with a volume of at least 20 liters under the drain hole of the hydraulic tank (usually located in the lower part).
  3. Unscrew the drain plug with a wrench 17 and drain the oil. If the oil is dark with metal particles - flush the hydraulic system.
  4. Remove the hydraulic tank cover (unscrew the 4 bolts with a wrench 19).
  5. Remove the filter element. If it gets stuck, carefully pry it off with a screwdriver without damaging the seat.

Step 2: Install a new filter

  1. Clean the seat from dirt and old sealant.
  2. Lubricate the new O-ring with hydraulic oil and install it on the filter.
  3. Insert the filter into the hydraulic tank, making sure that it fits tightly without distortion.
  4. Screw on the hydraulic tank cover by tightening the bolts crosswise (tightening torque: 25–30 Nm).

Step 3. Filling and bleeding the system

  1. Fill with fresh hydraulic oil through the filler neck (recommended brands: MGE-46V, Shell Tellus S2 M or Lukoil Hydraulic AW).
  2. Start the engine and let the hydraulics idle for 5-7 minutes to allow the oil to fill the system.
  3. Check the oil level (should be between the marks MIN and MAX) and no leaks.
💡

After replacing the filter, avoid maximum loads on the hydraulics for the first 2–3 hours of tractor operation. This will allow the oil to be evenly distributed throughout the system and avoid air pockets.

Cleaning the hydraulic tank filter: when you can and when you can’t

Many owners MTZ trying to save money by washing a clogged filter instead of replacing it. However, this is acceptable only for coarse strainers (for example, BFG-1). It is useless to clean paper or synthetic fine filters - their pores become clogged irreversibly.

How to properly rinse the strainer:

  1. Remove the filter and immerse it in a container with kerosene or special hydraulic system cleaner (for example, LIQUI MOLY Hydraulik-Reiniger).
  2. Leave for 1–2 hours, then rinse with a stream of compressed air (pressure no more than 3 bar).
  3. Check the integrity of the mesh: if there are breaks or deformations, the filter must be replaced.

For paper filters, only blowing with compressed air in the direction opposite to the oil flow (from the clean cavity side). But this is a temporary measure - the resource of such a filter after cleaning is reduced by 30–40%.

⚠️ Attention: Never use to clean filters gasoline, acetone or chlorine-based solvents. They destroy rubber seals and leave aggressive deposits in the hydraulic system.
What happens if you operate a MTZ with a clogged filter?

Prolonged work with a clogged filter leads to:

1. Increased wear of the hydraulic pump (the resource is reduced by 2–3 times).

2. Bullying the plungers hydraulic distributor - repairs will cost 15,000–25,000 rubles.

3. Hydraulic hose rupture due to increased pressure (especially dangerous for hoses with a service life of more than 5 years).

4. Power steering failure — the tractor becomes practically uncontrollable.

Common mistakes when servicing the hydraulic tank filter

Even experienced machine operators make mistakes that reduce the service life of the hydraulic system. Here are the most common:

  • ❌ Using uncertified filters. Cheap analogues often have low-quality paper, which decomposes in oil and clogs the system.
  • ❌ Hydraulic tank cover reupholstery. This deforms the O-ring and leads to air leaks.
  • ❌ Replacing the filter without flushing the hydraulic tank. Particles settled at the bottom will immediately clog the new filter element.
  • ❌ Mixing different brands of hydraulic oil. This causes the formation of foam emulsions and accelerates oxidation.
  • ❌ Ignoring the magnetic plug. Many people forget to clean the magnet in the drain plug, which catches metal shavings.

Another critical error - replacing the filter without checking the oil condition. If the oil turns black or has a burning smell, it needs to be replaced completely, not just the filter. Otherwise, the new filter element will clog within a few hours.

💡

The main rule: the MTZ hydraulic tank filter must be replaced every 500 operating hours or once a year (whichever comes first), even if it looks clean on the outside.

How to extend the life of the filter and hydraulic system?

Lifetime of the filter and all hydraulics MTZ depends not only on the quality of spare parts, but also on operating conditions. Here are proven ways to extend replacement intervals:

  • 🔧 Install an additional magnetic filter on the drain line. It captures up to 70% of metal particles, reducing the load on the main filter.
  • 🔧 Monitor the oil temperature. If it exceeds 80°C, install an additional cooling radiator.
  • 🔧 Use oil with additives (for example, LIQUI MOLY Hydro-Stabil), which slow down oxidation and the formation of varnish deposits.
  • 🔧 Drain the sediment periodically from the hydraulic tank (every 100 operating hours). To do this, just unscrew the drain plug 1-2 turns.
  • 🔧 Avoid working with an empty hydraulic tank. The oil level should not be below the mark MIN, otherwise the pump will “grab” air.

Pay special attention system tightness. Air leaks through leaks lead to oil foaming, which impairs filtration and accelerates filter wear. Check the condition of the hydraulic tank cap seals and fittings every 200 operating hours.

FAQ: Frequently asked questions about MTZ hydraulic tank filters

Can I use a car oil filter instead of the original one?

No. Car filters are not designed for pressure and oil flow in the hydraulic system MTZ. They may burst or fail to provide the required degree of cleaning. Use only specialized hydraulic filters marked HFP or BFG.

How often do you need to change the oil in the MTZ hydraulic tank?

The manufacturer recommends replacement every 1000 hours or once every 2 years. However, during intensive use (for example, in highly dusty conditions), the interval is reduced to 600–800 operating hours. Always change the oil along with the filter.

What should I do if, after replacing the filter, the hydraulics work jerkily?

Most likely there is air left in the system. Bleed the hydraulics:

  1. Raise the attachment to its highest position.
  2. Unscrew the air bleeder fitting on the hydraulic distributor.
  3. Move the control levers until oil flows out without bubbles.
  4. Tighten the fitting and add oil to the level.

If the problem persists, check the filter for defects or incorrect installation.

Is it possible to drive without a hydraulic tank filter if it is clogged?

Absolutely not! Without a filter, abrasive particles enter the hydraulic pump and distributor, which leads to their irreversible damage in a few hours of work. If the filter is clogged in the field, you can temporarily remove the filter element (leaving the housing), but immediately after completing the work, be sure to install a new one.

Which filter is better - original or analogue?

Original filters (80.3511010-01, 1221.3511010) are guaranteed to fit in terms of fitting dimensions and degree of filtration. However, high-quality analogues (for example, Mann H 1025 or Fleetguard HF6599) often surpass them in terms of resource and efficiency. The main thing is to buy from trusted suppliers to avoid counterfeits.