This seal kit is essential for maintaining the integrity of the main control valve in Volvo excavators, preventing internal and external hydraulic fluid leaks. It is manufactured to precise Volvo specifications, ensuring a robust seal that withstands high pressures and temperatures, unlike worn seals that allow fluid bypass. Operators may observe a loss of hydraulic system pressure, slow or jerky operation of multiple functions simultaneously, or external leaks from the valve body when this kit fails.
Always verify with serial number before ordering.
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Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The initial symptom of a failing main valve seal kit is often a slight decrease in the speed or power of one or more hydraulic functions. If ignored, this can progress to jerky movements, loss of simultaneous function capability, and noticeable external hydraulic fluid leaks from the valve body. Continued operation risks reduced machine productivity and potential damage to the hydraulic pump due to increased system strain.
Carefully clean all internal passages and spools of the control valve before installing the new seals to prevent contamination. Ensure each seal is correctly oriented and fully seated before reassembling the valve body.
Inspect the hydraulic control valve spools for wear or scoring, and check the hydraulic fluid for contamination when replacing the main valve seal kit.