Hydraulic Motor Seal Kits

Hydraulic motor seal kits can be purchased through McCann’s parts counter, with CASE seal kits also orderable through the CASE online parts store. Other brands are quoted and ordered through a branch parts counter. Provide the machine make, model, serial number and motor or final-drive tag so the correct kit can be identified.

A seal kit may be appropriate when hydraulic oil is weeping from the motor case or shaft area, or when gear oil is over-full, thin or milky while the machine still tracks or swings normally. Gear oil inspection and case drain testing should be considered first because internal motor wear or gearbox damage requires a different repair.

Provide the machine make, model and serial number, motor or final-drive tag data, and whether the unit is a travel or swing motor. Travel motors are part of final drives, while swing motors serve the excavator house. Identification from the tag and serial number is more reliable than ordering from the machine badge alone.

Usually not. Loss of tracking speed or power on one side, pulling to one side under load and excessive case drain flow indicate possible internal motor wear. A case drain flow test against the motor manufacturer’s limit helps confirm the condition. A seal kit addresses leakage, not worn pistons, slippers or other internal components.

Over-full, thin or milky final-drive gear oil can indicate hydraulic oil migrating past a failed motor shaft seal. Metal particles, bright glitter or chunks point toward planetary gear or bearing damage instead. Low or burnt oil may indicate the gearbox has been running starved. Drain inspection should be performed safely and with the machine properly supported.

McCann offers over-the-counter kit supply, branch service-shop fitting, diagnostic-first service and on-site replacement through equipped mobile service trucks. Accessing a final drive may also involve track removal, making undercarriage, hose and rubber-track inspection relevant to the same repair. The appropriate route depends on the diagnosis and equipment condition.