How to adjust the motor and V-belt of the cone crusher?

Time: 21.03.2025

1. Motor alignment

Adjust and ensure that the drive motor pulley of the cone crusher is aligned with the frame pulley and parallel to the shaft. When determining the center distance between the motor shaft and the transmission shaft, consideration should be given to the elongation of the V-belt during operation and the reserved space required for installation or removal of the V-belt. This reserved space should also include adjusting the elongated or deformed V-belt to maintain appropriate tension on the V-belt, which can extend the service life of the belt while ensuring its use.

2. Installation and tensioning of V-belts

Check the condition of the pulley - Before installing a new V-belt, the surface condition of the pulley should be checked. If there is grease or rust in the groove, it will reduce the transmission efficiency and wear the V-belt, which will cause the belt to fail prematurely.

Worn pulleys can reduce the lifespan of the V-belt by up to 50%. If the groove at the root of the belt is worn, it can cause slippage and belt burning; If there is severe wear on the side wall of the wheel groove to the point of concave, the diamond edge of the concave part will wear down the bottom edge of the belt, leading to premature failure.

Belt pulley groove alignment - Use the method of placing a straight edge ruler on the belt pulley or winding a rope around two belt pulleys so that their tangent points are in contact to check the alignment of the belt pulley groove. Usually, unevenness exceeding 0.5 (with a displacement of 1/8 inch per foot) will reduce the lifespan of the pulley, as misaligned grooves can cause uneven wear on one side of the pulley; The belt flips inside the groove, causing the load to be applied on one side of the belt, resulting in tension and breakage on one side of the belt inside.

Regarding installation and gap adjustment:

After calculating the center distance between the motor and the crusher pulley according to the standard length, shorten the center distance by a certain distance (i.e. installation gap) to ensure that the belt is not lost during installation. Then adjust the distance to ensure that the belt can be tensioned and maintained at an appropriate tension throughout its effective life. The specific data for adjusting the distance and installation gap are shown in the following table:

Length（mm）	Minimum installation clearance（mm）						Minimum adjustment distance（mm）
Length（mm）	9N（V-belt）	9J(V-group belt)	15N(V-belt)	15J(V-group belt)	25N(V-belt)	25J(V-group belt)	Minimum adjustment distance（mm）
≤1250	12	30					25
＞1205-1800	20	35	25	55			30
＞1800-2690	20	35	25	55		85	40
＞2690-3180	20	35	25	55	40	85	55
＞3180-4320			30	60	40	85	65
＞4320-5080			30	60	45	90	75
＞5080-6000			30	60	45	90	80
＞6000-6730			30	60	45	90	80
＞6730-7620			30	60	45	90	90
＞7620-9000			30	60	50	100	100
＞9000-9500					50	100	115
＞9500-12700					50	100	140

Length（mm）	Minimum installation clearance（mm）					Minimum adjustment distance（mm）
Length（mm）	A（V-belt）	B（V-belt）	C（V-belt）	D（V-belt）	E（V-belt）	Minimum adjustment distance（mm）
630-900	20	25				25
900-1600	20	25	40			40
1600-2240	20	32	40			50
2240-3150	25	32	40			65
3150-4000	25	32	40	50		75
4000-5000		32	50	50	65	90
5000-6300		40	50	50	65	100
6300-7100		40	50	65	65	115
7100-8000		40	50	65	75	125
8000-11200			50	65	75	150

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