How to Choose Grease for Shock-Loaded Industrial Bearings

Picture a stone crusher yard on the edge of a small highway town. Boulders tumble into a hammer crusher, and every strike sends a jolt through the shaft and straight into its bearings. The noise never stops, and neither does the punishment.

Elsewhere, a steel plant runs its cold rolling mill round the clock, and a cement kiln turns slowly on its support rollers. Each of these machines takes heavy loads that arrive suddenly, again and again.

Choosing the right grease for shock-loaded bearings is essential in crushers, steel mills, cement plants, and other heavy-duty applications. Pal EP Pro Grease is a lithium-based extreme-pressure grease designed for demanding industrial bearing conditions. This guide explains how EP additives, base oil viscosity, and NLGI grades influence grease selection.

What Is Grease for Shock-Loaded Bearings?

Pal EP Pro Grease is a premium-quality, lithium-based extreme-pressure grease made by Paras Lubricants Limited under the PALCO brand. It has a smooth, homogeneous texture and a brownish colour.

It is designed for heavy-duty plain and rolling bearings operating at moderate temperatures and slow to medium speeds. Its formulation combines:

• Lithium thickener, which holds the oil in place and helps maintain mechanical stability.
• Extreme pressure (EP) additives, which improve load-carrying ability under heavy and shock-loaded conditions.
• Anti-wear properties, which help reduce wear on metal surfaces during operation.
• Tackifiers, which help the grease adhere to components and resist water wash-off.

Pal EP Pro Grease is available in NLGI 2, NLGI 1 and NLGI 0 grades (Pal EP-2 Pro, EP-1 Pro and EP-0 Pro). Each grade is designed for particular lubrication requirements.

Explore PALCO’s range of industrial greases for different load, temperature, and machinery requirements.

How EP Grease Protects Bearings Under Shock Loads

When machinery experiences sudden or repeated loads, the lubricant film between moving metal surfaces can become thinner. The right extreme-pressure grease helps protect these surfaces against excessive wear, scuffing, and potential seizure.

What Does Extreme Pressure Mean?

Extreme-pressure additives provide extra protection when heavy loads stress the lubricating film. This is particularly relevant in equipment such as hammer crushers, ball mills, and other machinery exposed to repeated impacts.

What Does Weld Load Tell You About Grease?

Weld load measures the load at which steel balls seize and weld together during a standard four-ball test. It is one indicator of a grease’s extreme-pressure performance.

All three grades of Pal EP Pro Grease have a published minimum weld load of 315 kg.

Why Base Oil Viscosity Matters for Heavy Bearings

Pal EP Pro Grease has a published base oil viscosity of 460 cSt at 40°C. This high-viscosity base oil is relevant to slow-moving, heavily loaded bearings where the lubricant must support demanding operating conditions.

However, the correct viscosity also depends on bearing design, operating speed, temperature, and equipment requirements.

NLGI 2 vs NLGI 1 vs NLGI 0 Grease

NLGI grades indicate grease consistency. The lower the NLGI number, the softer the grease.

NLGI 2 has a firmer, commonly used consistency, while NLGI 1 and NLGI 0 are progressively softer. Softer grades may be suitable for certain centralised lubrication systems, depending on the equipment design and operating conditions.

Pal EP Pro Grease has the following published operating temperature ranges:

• EP-2 Pro: -20°C to 140°C
• EP-1 Pro: -20°C to 130°C
• EP-0 Pro: -20°C to 120°C

Always confirm the required grade against the equipment manufacturer’s recommendations.

Key Features of Pal EP Pro Grease

Protection Under Shock Loads

Palco states that Pal EP Pro Grease offers high shock-load absorption. Its EP additives and anti-wear properties help protect bearings subjected to sudden changes in load.

Mechanical Stability During Operation

Mechanical stability describes a grease’s ability to retain its consistency during prolonged mechanical working.

In published testing, the NLGI 2 grade shows a consistency change of no more than +17 points after 100,000 strokes of working.

Resistance to Water Wash-Off

Water ingress and wash-down conditions can remove grease from bearing surfaces. Pal EP Pro Grease is formulated to resist water wash-off.

The NLGI 2 grade has a published maximum weight loss of 3.6% in the standard water washout test.

Pumpability in Lubrication Systems

Pumpability refers to how readily grease moves through grease lines, fittings and centralised lubrication systems.

Palco states that Pal EP Pro Grease is designed for lubrication systems, particularly in the cold rolling, turning and sizing sections of steel mills. The appropriate NLGI grade should be selected according to the system’s requirements.

Rust and Corrosion Protection

Palco states that the grease provides rust protection and resistance to oxidation and corrosion. All three grades have a published 1b copper corrosion rating.

Compliance with Steel Industry Specifications

Pal EP Pro Grease exceeds IPSS: 1-09-006-1997 and meets US Steel 374, according to the published product information.

Applications for Shock-Loaded Bearings

Steel Mills and Cold Rolling Sections

Steel mill bearings can experience continuous heavy loads during production. Pal EP Pro Grease is listed for cold rolling, turning, and sizing sections, with paper industry applications also included in its published application information.

For applications involving high temperatures and water exposure, explore PAL LITHCOM 3 lithium complex grease.

Cement Plants: Kiln Support Rollers and Couplings

Cement plants use heavy machinery that operates under demanding loads. Pal EP Pro Grease is recommended for kiln support roller bearings, flexible gear couplings, and plain and antifriction bearings in suitable applications.

Mining and Stone Crushing Equipment

Mining machinery takes constant shock. Pal EP Pro Grease is recommended for hammered stone crushers and ball mill bearings. For related applications, explore PALCO’s grease for mining and construction equipment, designed for equipment exposed to heavy loads and shock loading.

Earthmoving and Agricultural Equipment

Earthmoving machinery and heavy-duty agricultural equipment can operate in dusty, wet, and demanding environments. Grease selection should account for the equipment’s bearing design, load conditions, and service recommendations.

Why Choose PALCO?

Paras Lubricants Limited was incorporated in 1985 and has more than four decades of experience in lubricants. The company has its head office in Delhi, a western office in Mumbai, and a manufacturing facility in Daman.

PALCO offers products across automotive oils, industrial oils, greases, and auto care. Its published company information includes exports to more than 25 countries and manufacturing under an ISO 9001-certified quality management system.

Pal EP Pro Grease is available in 180 kg and 18 kg packs for industrial and bulk users. PALCO’s technical team can help buyers assess the suitable grade and pack size for their application.

How to Choose Grease for Shock-Loaded Bearings

Start with the equipment manufacturer’s lubrication recommendations. Then consider the bearing type, load severity, operating speed, temperature, and how the grease will be delivered.

NLGI 2 may suit applications requiring a firmer grease, while NLGI 1 or NLGI 0 may be appropriate for certain lubrication systems. The correct choice depends on the equipment and its operating conditions.

Application Tips

• Clean grease nipples and fittings before lubrication to prevent dust and debris from entering the bearing.
• Avoid mixing incompatible greases. When changing products, follow the equipment manufacturer’s recommended procedure.
• Avoid overgreasing, which can contribute to heat build-up and seal damage.
• Check centralised lubrication lines and distributors for blockages and confirm that all lubrication points receive grease.

Storage Tips

Keep grease containers closed and protected from sunlight, moisture, and dust. Use clean dispensing equipment and follow the manufacturer’s storage recommendations.

Monitor Bearing Condition

Watch for unusual temperature increases, new noises, contamination, or changes in grease condition. Review lubrication intervals when operating conditions are particularly demanding, following the equipment manufacturer’s guidance.

Final Thoughts

Selecting the right grease for shock-loaded bearings means considering load severity, base oil viscosity, NLGI consistency, operating temperature, and lubrication method. These factors matter in crushers, steel mills, cement plants, and other heavy-duty machinery.

Pal EP Pro Grease combines a lithium thickener, extreme-pressure additives, and a 460 cSt base oil with NLGI 2, NLGI 1, and NLGI 0 options for different lubrication requirements.

Explore the Pal EP Pro Grease product page for published specifications and technical details, or contact PALCO to discuss the right grease grade for your application.