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Medal Group

Quality

The more than 400 products developed by Medal pass through the hands of a team of highly qualified and constantly trained professionals to guarantee the best to our customers. Technicians and engineers follow the entire production process with quality and precision control through advanced testing and technology laboratories. All Medal products are in accordance with international quality norms and standards, with a quality management system certified by ISO 9001.

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CAUSES FOR DAMAGE IN HYDRAULIC PUMPS

Burnt shaft gear

Discoloration of gears due to excessive heat.

CAUSES FOR DAMAGE

PTO was left engaged while truck driven. Dump pump used in continous duty application. Relief valve set too low or stuck open.

SOLUTION

Review application and replace the pump. Use automatic PTO ckick-out valce Check the the relief valve setting and function. The heat discoloration is often a secondary symptom of cavitation, damage due to contamination, to high oil temperature, or still over-revving pump.

Thrust plate cracking

Cracks or complete fractures of the thrust plate

$Medal - Solução de danos em bombas: Thrust plate cracking - Cracks or complete fractures of the thrust plate$

CAUSES FOR DAMAGE

Pump operated beyond its pressure rating or subjected to pressure spikes.

SOLUTION

Review application and check against the pump specifications. Check relief valve setting and function.

Housing cut out

Pump housing cut-out in excesso of 0.127mm due to over pressurization.

CAUSES FOR DAMAGE

Pump over pressurization. The pump is being operated beyond its pressure rating or subjected to sudden pressure spikes.

SOLUTION

Review application and check against the pump specifications. Check relief valve setting and function. Replace pum por body section.

Shaft spline fretting

Worn shaft splines with borwnish residue. The PTO shaft splines will show similar wear.

CAUSES FOR DAMAGE

Caused by a combination of a lack of lubrication and harmonic engine vibrations.

SOLUTION

Replace pump shaft. Apply lubricant at regular service intervals. Specify PTO with greaseable output shaft option.

Shaft keyway damage

Edges of keyway damaged. Marks where set screw moved under load.

CAUSES FOR DAMAGE

Loose and yoke set screw. Seized slip yoke on driveshaft.

SOLUTION

Replace pump input shaft. Repair or replace driveshaft.

Broken or twisted shaft

Shaft is broken or twisted off at base of spline área.

CAUSES FOR DAMAGE

Excessive operating torque or severe shock load.

SOLUTION

Review application and check against the pump specifications. Replace pump shaft. Check operation and setting of system relief valve.

Plate damage due to contamination

Deep scratch on the face of the thrust plate.

CAUSES FOR DAMAGE

Contaminant particle if interposes between plate and gear. Fine particle contaminates in high concentration.

SOLUTION

Replace thrust plates selas. Flush entire system and replace oil and filters.

Burnt thrust plate

Thrust plate face is blackened.

CAUSES FOR DAMAGE

Pump overheating.

SOLUTION

Replace thrust plates and all pump seals. Inspect others pump componentes for damage. Check relief valve setting and function. Heat discoloration is often a secondary symptom of cavatation or contamination damage

Thrust plate phonographing

Circular scoring on thrust place face resembles the grooves on a record..

CAUSES FOR DAMAGE

Large particle (sand, metal shaving, etc.) contamination.

SOLUTION

Replace thrust plates and seals. Flush entire system and replace oil and filters.

Thrust plate pitting

Pitting of thrust plate surface, often in a “U” shaped pattern. May also occur on the pump body walls.

CAUSES FOR DAMAGE

Excessive vacuum at the pump inlet creates cavatition bubbles which implode on the outlet side of the pump.

SOLUTION

Check vacuum at pump inlet. It should not exceed 0.3 kg/cm². Increase diameter of inlet hose. Clean the suction strainer and reservoir breather. Romeve suction line filter.

Burnt pump body

Discoloration of the pump body in the gear housing or relief valve área due to excessive heat.

CAUSES FOR DAMAGE

PTO left engaged while truck driven. Relief valve set too low or stuck open.

SOLUTION

Review application and replace pump. Check relief valve setting and function. Use automatic PTO kick-out valve.

Cracked housing

Pump body cracked at pressure port due to over pressurization.

CAUSES FOR DAMAGE

Over pressurization. The pump is being operated beyond its specification of pressure or subjected to sudden pressure spikes. It can also caused overtightening of NPT fittings.

SOLUTION

Review application and check against the pump specifications. Check relief valve setting and function. Replace pump or body section. Check relief valve setting at least 15% above the maximum operating pressure. Check toque specification of fittings.

Warranty

Medal products are manufactured with the highest technology and by specialized professionals to achieve the accuracy and reliability of the original parts. The attention dedicated to each product and the application of the highest quality standard, guarantee Medal products the maximum durability, safety and performance that your equipment needs. All of these features guarantee more performance to your equipment.

Follow these recommendations for a better hydraulic pump life:

Find out the reason for the damage of the product being replaced. If the cause is not eliminated, it will also be damaged.

Never mount a new product on a duty circuit. Most damage is caused by working with contaminated oil.

Wash the Tank with solvent and dry , do not use cotton waste, Remove and wash the tubes and hoses with pressurized liquid without leaving any residue.

Make sure that the contaminants are completely removed from the circuit.

Always keep the oil level in the reservoir correct. At a low level, the pump can cavitate, damaging all components of the circuit.

Always observe the filter and oil expiration according to the manufacturer's instructions. Expired, the oil loses its original characteristics and becomes very acidic. This speeds up the component wear process.

Make sure that the alignment of the pump with the drive shaft is not causing any loads to its operation.

Start working with the open circuit (without pressure) for a few minutes. Then gradually increase the pressure and speed until all air in the system is exhausted.