How to check if the seal matches the cleaning parts when installing a new seal for the WPDA80-60-0.75KW gearbox

When installing new seals for the WPDA80-60-0.75KW gearbox, double verification is required from both the compatibility of seal specifications and component cleanliness to ensure that the seals are compatible with the installation position and free of impurities that interfere with the sealing effect. The specific inspection method is as follows:
1、 Check the specification matching between the seal and the installation position
1. Verify the sealing component model against the original factory parameters

Firstly, confirm that the model of the new seal (such as the model of the shaft end skeleton oil seal may be TC 30 × 50 × 10, etc.) and the material (nitrile rubber/fluororubber, etc.) are consistent with the original manual of the gearbox, and focus on checking the key dimensions:

Skeleton oil seal: inner diameter (matched with the shaft neck), outer diameter (matched with the end cover sealing groove), thickness (matched with the groove depth), with an error controlled within ± 0.1mm (for example, if the shaft neck is 30mm, the inner diameter of the oil seal should be 30mm ± 0.1mm, excessive interference will cause lip tearing during installation, and if it is too small, it is easy to leak).

O-ring/joint surface seal: The wire diameter and inner diameter should match the size of the sealing groove. After being placed in the groove, it should naturally adhere to the groove wall without excessive stretching (stretching amount ≤ 5%) or relaxation (gap>0.2mm).

If it is a replacement part, it is necessary to compare the dimensions of the old seal (measure the unworn parts of the old part) to ensure that the key dimensions of the new part are consistent and avoid mismatches caused by model confusion (such as slight differences in seals for different power models in the WPDA series).

2. Physical trial assembly inspection and installation clearance

Shaft end oil seal trial fitting: Gently fit the new oil seal onto the shaft neck (before pressing it in), observe the fit between the inner diameter of the oil seal and the shaft neck - if it can slide easily without obvious shaking, it indicates that the interference fit is appropriate; If it is difficult to insert or if the rubber lip turns outward, it may be due to a smaller inner diameter; If there is a gap (which can be shaken) after insertion, the inner diameter is too large and needs to be replaced with a different specification.

Sealing groove trial fitting: Place the O-ring or flat sealing gasket into the sealing groove and press it with your fingers to check:

The seal should be completely filled into the groove, with edges not exceeding the outside of the groove, and without wrinkles or distortions;

When rotating the seal along the circumference of the groove without any jamming, it indicates that the outer diameter/length of the seal matches the groove, avoiding deformation caused by compression during assembly due to excessive size, or incomplete coverage of the sealing surface due to insufficient size