Home > faq

Holes Shouldn't Be Blocked

June 01, 2019

Some "holes" in the construction machinery shouldn't be blocked, for example: 

(1) Pump spill hole and drainage hole. The pump shaft is designed with a spill hole which can detect whether there is a leak in the pump and discharge the water leaked from the pump through it. If this hole is blocked, then the water leaked will enter the pump bearing to affect lubrication, resulting in damage to bearing and pump shaft. When the drainage pump is not operating, the drainage hole can be used to drain the retained water out of the shell. If this hole is blocked, the cooling water left in the pump will damage the water seal.

(2) The oil drain hole in the diesel oil transfer pump can directly drain off the leaked diesel oil from the pump. When this hole is blocked, the diesel oil left in the transfer pump will enter the oil pan of the injection pump to dilute lubricating oil, causing oil deterioration.

(3) The diesel engine is difficult to start if the 2mm conical nozzle in the cylinder head is obstructed.

(4) Once the oil return hole of the diesel engine injector is blocked, redundant diesel oil can not return to the fuel tank. This may cause the pressure in the oil return duct and injector increases, and consequently, change oil injection time.

(5) The vent hole in the fuel tank cap is used to prevent the formation of a vacuum as the oil level decreases, thus ensuring the normal oil supply.

(6) The vent hole in the oil filter cap can discharge waste gas out of the crankcase. The blockage of this hole will lead to oil leakage and oxidation deterioration.

(7) The diesel engine lubricating hole, through which the rocker arm, rocker shaft and valve push rod are lubricated, will significantly accelerate the wear of mechanical parts if it is obstructed.

(8) The dust discharge hole in the air filter can discharge dust particles. If this hole is blocked, the dust may enter into the next filtration device or even the cylinder, thereby accelerating mechanical parts wear.

(9) There are many oil return holes in the piston ring groove of the diesel engine, through which the excess oil scraped off cylinder walls can flow back into the crankcase. Blockage of these holes will make a large amount of oil enter into the combustion chamber and then cause oil burning.

(10) The drainage holes in the engine oil cooler and water radiator are intended to drain the cooling water out of each part. If these holes are blocked, especially in winter, the cooling water will freeze and thus damage the oil cooler and water radiator.

(11) The vent hole in the auxiliary water radiator cap of diesel engine. The formation of pressure difference between the main radiator and auxiliary radiator will be influenced if this hole is blocked, which could hinder the cooling liquid in the auxiliary radiator from flowing back into the main radiator, thus greatly affecting the cooling effect.

(12) The holes in the hydraulic oil tank, transmission and torque converter etc. are designed to balance the internal pressure within the tank and discharge high temperature gas so as to prevent the temperature from rising rapidly and oil deterioration.

(13) The vent holes in the main reducing gear shell are used to prevent high oil temperature and high air pressure in the shell, thus effectively protecting the seals from being damaged.

(14) The vent hole, oil return hole and compensation hole in the cover of the brake master cylinder ensure supplement and backflow of the braking fluid. Blockage of these holes may cause braking problems and cylinder oil leak.

(15) The small holes in the main clutch and steering clutch are responsible for promptly removing oily d oily dirt from these clutches. If these holes are obstructed, the oily dirt will enter the friction plate surface and thus cause problems such as clutch slippage.