Sep 18, 2020

Pump Compensator and Main Relief Valve Adjustment Demonstration

One of the most common, hydraulic systems issues we help our customers troubleshoot is hydraulic systems running too hot. More often than not, this is due to having a pressure-compensated pump and the fluid being dumped over the relief rather than over the compensator- creating heat.

To learn more, watch this follow-up video (part 2 of Hydraulic system running too hot?) of John Henry Foster's hydraulic guru, David Granade- Fluid Power Specialist, as he demonstrates how adjustments on the pump compensator and main relief valve, can help.


John Henry Foster – 100% Employee-Owned ESOP Company

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We Are Proudly 100% Employee-Owned

At John Henry Foster Company of St. Louis, ownership isn’t just a structure — it’s a mindset.

What It Means to Be an ESOP Company

As a 100% Employee-Owned company, every individual at JHF has a direct stake in our success. Our people don’t just work here — they own the outcome. This drives higher engagement, better service, and long-term commitment to our customers.

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✔ Accountability at Every Level

Employee-owners take pride in doing things right — the first time. Every project reflects our personal investment in your success.

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Ownership builds stability. Our customers benefit from low turnover, deep expertise, and trusted relationships.

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We innovate because we care. From automation to pneumatics, fabrication to service — we constantly improve to deliver more value.

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Employee ownership creates a culture where people feel valued, empowered, and motivated. Every owner contributes to a workplace built on collaboration, integrity, and pride in craftsmanship.

✔ Empowered Employees

Ownership gives every team member a voice — and a reason to go above and beyond.

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Our ESOP ensures JHF stays locally owned, culturally strong, and built for future generations.

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