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What is the normal temperature range for hydraulic oil?

2 Answers

VonLucille

07/24/25 2:11pm

The normal temperature range for hydraulic oil is 30°C to 70°C. Prolonged exposure to temperatures above 70°C will reduce the engine's service life, while temperatures below 30°C will make the engine difficult to start. Below is an introduction to the classification of hydraulic oil: HH type: HH hydraulic oil is a mineral oil that does not contain any additives. Although this oil is included in the classification, it is no longer used in hydraulic systems due to its poor stability, tendency to foam, and short service life in hydraulic equipment. HL type: HL hydraulic oil is made from highly refined neutral base oil with added anti-oxidation and anti-rust additives. HL hydraulic oil can be divided into six grades based on its kinematic viscosity at 40°C: 15, 22, 32, 46, 68, and 100. HM type: Anti-wear hydraulic oil (HM hydraulic oil) is developed from rust-proof and anti-oxidation hydraulic oil. It includes a series of products such as high-alkaline zinc, low-alkaline zinc, neutral high-zinc, and ashless types.

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MargaretAnn

08/11/25 8:04am

I usually pay attention to the hydraulic system when driving. The normal temperature range for hydraulic oil is typically between 40 and 80 degrees Celsius, with around 60 degrees being the optimal balance point. If it gets too high, say over 90 degrees, the oil will thin out, reducing lubrication effectiveness and making the steering feel light and floaty. If it's too low, like below 30 degrees during cold starts, the high viscosity can cause sluggish responses and affect handling. During long summer highway drives, temperatures can rise quickly, so I make sure to take breaks to let the cooling system work. If the vehicle's dashboard warning light comes on, it signals overheating—don't ignore it. Check for issues like a dirty filter or oil leaks early on. Regular oil changes and hydraulic fluid level checks are crucial. I make it a habit to do this every six months, which helps avoid major repair costs and ensures safe, smooth driving.

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