CAT 336E / 336F Main Hydraulic Pump – China Remanufactured (377-4968)

Description

Detail Information

Note: The application information provided is for reference only. Please confirm the part number and compare it with the old component before purchasing. If you have any questions, please feel free to contact us.
It is worth choosing a product that features stable performance, high reliability, easy installation, and quick response.

1. Key Features & Benefits

• Precision‑remanufactured to Caterpillar OEM standards – This main hydraulic pump (OEM 377-4968) has been fully disassembled, cleaned, crack‑inspected, and rebuilt to meet Caterpillar’s original equipment specifications. Every critical component – cylinder block, piston assemblies, valve plate, swashplate, bearings, and seals – is either renewed or replaced with new, high‑quality parts. The result is restored hydraulic performance at a fraction of the cost of a new genuine pump.

• Direct replacement for CAT 336E and 336F series excavators – Specifically engineered for Caterpillar 336E, 336E L, 336E LN, 336F, 336F L, and 336F LN 36‑ton class excavators. This dual‑variable displacement axial piston pump (SBS180 architecture) powers the boom, arm, bucket, swing, and travel circuits with the precise, high‑volume flow required for heavy construction, quarrying, and mining operations.

• Massive hydraulic output for 36‑ton class work – With a displacement of approximately 180 cm³/rev per pump group, this pump delivers the substantial hydraulic power necessary for rapid boom lift and high‑torque swing operations. The CAT 336F main system delivers a total maximum flow of 570 L/min (151 gal/min), providing the power needed for fast cycle times, high bucket fill factors, and responsive multi‑function operation.

• High‑pressure capability for demanding applications – Rated for continuous operation at 350 bar (35 MPa / ≈5,076 psi), with heavy‑duty construction allowing for pressure spikes up to 380 bar during heavy breakout tasks. This pressure capability delivers consistent digging force, swing torque, and travel power hour after hour in the most demanding applications.

• Energy‑efficient, optimized design – Features an optimized swash plate design that reduces heat generation and internal friction, contributing to the fuel efficiency standards of Tier 4/Stage IV engines. The pump regulators are factory‑calibrated to interface seamlessly with the CAT machine control system (ECM), ensuring smooth load‑sensing and flow‑sharing capabilities. Major hydraulic components are located close together to reduce friction loss and pressure drops, delivering more power to the ground.

• Superior durability and contamination resistance – Utilizes high‑strength alloy cylinder blocks and precision‑lapped piston shoes to ensure minimal internal leakage and maximum volumetric efficiency. Equipped with oversized, low‑friction bearings to withstand the high radial and axial loads generated during multi‑function hydraulic movements. Premium seals and gaskets are installed to withstand extreme pressures and temperatures.

• Reinforced structural design – Features a reinforced structural design that ensures high‑pressure stable output and energy‑efficient performance, making it an ideal choice for maintenance and replacement in demanding environments.

• Direct bolt‑on replacement – Mounting flange, drive shaft spline, and hydraulic port configurations are restored to original Caterpillar specifications. No modifications, no adapters – your mechanic unbolts the old pump and bolts this one in.

• Pre‑shipment visual verification – Before packing, we send you detailed high‑resolution photographs of the actual unit (mounting flange, splines, port threads, castings, overall condition). You approve shipment – we never ship blind.

• Fast delivery – 5–8 working days lead time from our Guangzhou warehouse. Monthly supply capacity of 300 units, available for single‑piece or bulk orders.

2. Applications

The remanufactured CAT 377-4968 main hydraulic pump is the power source for 336E and 336F series excavators used in the most demanding job sites:

• Large‑scale open‑pit mining – 36‑ton excavators are the backbone of copper, gold, iron ore, and coal mining operations. The pump’s 180 cm³/rev displacement and 350 bar continuous pressure capability deliver fast loading cycles and consistent digging force hour after hour in remote mine sites where reliability is critical. The heavy‑duty construction and oversized bearings withstand the extreme shock loads of hard rock extraction.

• Quarrying & aggregates – Loading trucks, stockpile management, and material handling in granite, limestone, and basalt quarries. The pump’s robust alloy cylinder blocks and precision‑lapped piston shoes withstand abrasive dust conditions, while the load‑sensing flow‑sharing capability provides smooth, responsive operation for precise bucket control.

• Heavy construction & infrastructure – Highway excavation, dam building, bridge footings, and large‑scale earthmoving projects. The pump’s massive flow (570 L/min total) and high‑pressure capability (350 bar) deliver consistent digging force and swing torque hour after hour, while the energy‑efficient design reduces fuel consumption across long shifts.

• Demolition & scrap processing – Shock loads, vibration, and sharp debris are routine in demolition yards and metal recycling facilities. The pump’s reinforced structural design and heavy‑duty bearings absorb these extreme conditions without premature wear.

• Equipment rental fleet – 36‑ton excavators are high‑value rental assets. A remanufactured pump offers predictable performance at a cost that makes proactive replacement financially sensible – avoiding costly mid‑rental failures, towing bills, and customer complaints.

• Forestry & land clearing – Steep slopes, fallen timber, and uneven terrain demand reliable hydraulic performance. The pump’s consistent pressure output (350 bar continuous, 380 bar peak) maintains stable power for saws, grapples, and mulchers.

3. Why Choose Hongtengda Parts

Since 2001, Hongtengda Parts has been a leading distributor of earthmoving machinery parts, serving customers across Southeast Asia, the Middle East, Africa, the Americas, and Oceania. Headquartered in Guangzhou’s Zhucun parts hub – one of Asia’s major distribution centres for construction machinery parts – we combine deep inventory, cross‑brand knowledge, and reliable global shipping to keep your machines running.

What you get when you order from us:

• 25 years of heavy equipment parts experience – Since 2001, we have been the go‑to supplier for repair shops, fleet owners, and wholesalers worldwide. We know the CAT 336E and 336F platform inside out – the different engine variants (C9.3 ACERT), control systems, and production changes over the years.

• Remanufacturing that delivers performance comparable to new – Our remanufacturing process follows strict quality standards to ensure same‑as‑new quality and performance. Each pump is rebuilt using precision engineering principles, with all critical wear components replaced – not just patched or resealed. Cat Certified Hydraulic Rebuilds bring pumps, motors, and valves back to like‑new performance, reliability, and durability.

• 90% of our catalog in stock – Your pump sits in our Guangzhou warehouse, not in a supplier’s backlog. From hydraulic pumps to undercarriage kits, most orders are dispatched within 24 hours on fumigated, export‑ready pallets.

• One supplier, all parts – Got a serial number, a model code, or just a photo of a worn‑out part? Our specialists cross‑reference across Caterpillar, Komatsu, Hitachi, Sany, and 15+ brands to find what you need. OEM, OEM‑quality, or hard‑to‑find older model parts – we handle the search so you don’t have to.

• Own maintenance factory and technical team – Equipped with our own maintenance factory and a team of experienced technicians, we provide global customers with one‑stop solutions covering parts supply, technical support, and equipment maintenance.

• Pre‑shipment verification – We never ship a pump blind. You receive clear photos of the actual unit before packing – you approve, we ship. When downtime costs money, we move at your speed.

• Cost‑effective alternative to new OEM – Remanufactured pumps deliver the same performance as new Cat pumps while priced at a fraction of the cost. This makes proactive replacement financially accessible for fleet owners and repair shops alike.

• After‑sales support that works – Three senior technicians review your case together. If it’s a quality issue – we cover it. If not – we still guide you through the fix. We don’t just sell parts; we keep you running.

Send us your CAT 336E or 336F machine serial number and a photo of the old pump – we will confirm the exact model and quote you within 24 hours.

4. FAQ – Frequently Asked Questions

Q1: What is the correct part number for the CAT 336E / 336F main hydraulic pump?
A: The primary OEM part number for this pump is 377-4968. It is also compatible with and replaces Caterpillar factory part numbers 377-4950, 369-9641, 334-9937, and 497-8501. To confirm the correct part for your specific machine, send us your machine serial number and a photo of the old pump nameplate – we will verify within 2 hours.

Q2: Is this a new pump or a remanufactured unit?
A: This is a professionally remanufactured pump. All internal wear components (bearings, seals, cylinder block, valve plate, pistons) are replaced or re‑ground to OEM specs. The result is a pump that performs like new – at a fraction of the cost.

Q3: What are the key specifications of this pump?
A: The pump is a dual‑variable displacement axial piston pump (SBS180 architecture) with a displacement of approximately 180 cm³/rev per pump group. Total maximum flow is 570 L/min (151 gal/min). Continuous operating pressure is 350 bar (35 MPa / ≈5,076 psi), with pressure spikes up to 380 bar. Travel circuit pressure is 350 bar, and swing circuit pressure is 280 bar (≈4,061 psi). The pump weighs approximately 342 kg.

Q4: What is the warranty on this pump?
A: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for original used or remanufactured parts. Our value is delivered up front: careful remanufacturing, thorough testing, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote new aftermarket units – ask our sales team.

Q5: How long does delivery take?
A: Delivery is 5–8 working days after order confirmation from our Guangzhou warehouse. Express shipping (DHL/FedEx/UPS) is available for urgent orders.

Q6: What payment methods do you accept?
A: We accept L/C, T/T, XTransfer, PayPal, and Western Union.

Q7: How can I verify the pump is ready before shipping?
A: Before packing, we send you clear, high‑resolution photographs of the actual unit – mounting flange, splines, port threads, casting marks, and overall condition. You approve shipment only after reviewing these images. We never ship blind.

Q8: What oil should I use with this pump?
A: Use a mineral oil‑based anti‑wear hydraulic fluid as recommended by Caterpillar. The hydraulic system capacity is 380 L total including tank. Proper hydraulic fluid contamination control is essential to prevent premature wear and extend the pump’s working life. Always refer to your CAT 336E or 336F operator’s manual for the correct viscosity and specification.

Critical installation tip for the 377-4968 remanufactured pump:
– Case priming is MANDATORY. You must fill the pump housing with clean hydraulic oil through the topmost case drain port before starting the engine.
– The case drain line must be clear and unrestricted. A blocked or kinked case drain will build back pressure inside the pump housing and blow the shaft seal instantly on first startup.
– Before installing the remanufactured pump, flush the entire hydraulic system and replace all filters. Contaminants from a failed pump will destroy a remanufactured unit just as quickly as a new one – debris does not discriminate.
– Use new O‑rings and sealing washers on every hydraulic connection. Reused seals guarantee leaks.
– After installation, run the engine at low idle for 2‑3 minutes with the pump in neutral, then slowly cycle each function (boom, arm, bucket, swing, travel) to purge air from the system.
– Check pump alignment with the engine flywheel housing – misalignment causes premature bearing wear and shaft seal leakage.

Warranty note: Warranty period is 3 to 6 months depending on product details. We do not provide warranty service for original used or remanufactured parts. Our value is delivered up front: careful remanufacturing, thorough testing, and pre‑shipment visual verification. For customers who require a warranty‑covered option, we can quote new aftermarket units – ask our sales team.

The main hydraulic pump is the heart of your CAT 336E or 336F’s hydraulic system. Our remanufactured 377-4968 gives you restored 36‑ton class performance at a cost that keeps your budget intact – not with shortcuts, but with genuine factory‑grade restoration. Send us your machine serial number – we will confirm compatibility and provide a quote within 24 hours.