Caterpillar 336 Hydraulic Pump: Complete Specifications, Features & Buying Guide (2026)

Quick Answer

Key Takeaways

• Part numbers for the CAT 336 / 340 main pump: 568-3006 / 568-3007, available with 13T or 15T spline.
• Designed as a direct bolt-on replacement - precisely matched spline interface, no modification required.
• The CAT 336D2: 36-ton class, Cat C9 ACERT engine, 201-209 kW (270-280 hp), operating weight approx. 34,600 kg, bucket approx. 1.88 m³.
• Key engineering points: stable volumetric efficiency under high pressure, fast response, and wear- and heat-resistant seals.
• Failure signs: weak digging force, slow swing, abnormal noise, overheating, oil leaks, pressure drop.
• Before ordering: confirm machine model, serial number, old pump part number, and the spline tooth count (13T or 15T).

Table of Contents

1. Introduction: The CAT 336 and Its Hydraulic Pump
2. Caterpillar 336D2 Excavator Key Specifications
3. CAT 336 Hydraulic Pump Specifications
4. Genuine vs OEM vs Aftermarket vs Rebuilt: Comparison Table
5. RITO HYDRAULIC CAT 336 Hydraulic Pump: Key Features
6. Common Hydraulic Pump Problems & Symptoms
7. Maintenance & Service Tips
8. Buying Guide: What to Check Before Buying
9. Real-World Case Study: CAT 336 Hydraulic Pump Supply (Export Project)
10. FAQ - CAT 336 Hydraulic Pump
11. Conclusion: Get the Right 336 Pump for Your Machine

1. Introduction: The CAT 336 and Its Hydraulic Pump

• The Caterpillar 336 family (336, 336D2, 336E) is one of the most widely used 36-ton-class excavators in mining, quarrying and heavy construction worldwide.
• The hydraulic main pump is the heart of the machine's working system - it converts engine power into hydraulic flow and pressure for the boom, arm, bucket, swing and travel functions.
• When the main pump fails, the machine loses digging force and swing speed; replacement with the correct part number and spline type restores full performance.
• RITO HYDRAULIC supplies direct-fit main pumps for the 336 / 340 family with verified part numbers and spline options.

2. Caterpillar 336D2 Excavator Key Specifications

3. CAT 336 Hydraulic Pump Specifications

4. Genuine vs OEM vs Aftermarket vs Rebuilt: Comparison Table

5. RITO HYDRAULIC CAT 336 Hydraulic Pump: Key Features

• Precisely Matched Spline Interface - direct installation with no modification, saving labor and downtime.
• Stable Volumetric Efficiency Under High Pressure - fast response and strong excavation performance.
• Wear- and Heat-Resistant Seals - less oil leakage and lower downtime risk.
• Available for CAT 336 / 340 with part numbers 568-3006 / 568-3007, in 13T or 15T spline options.

6. Common Hydraulic Pump Problems & Symptoms

• Weak digging force - worn pistons or valve plate reduce volumetric efficiency.
• Slow swing and travel - insufficient flow caused by internal leakage.
• Abnormal noise (knocking/whining) - cavitation, worn bearings or loose couplings.
• Overheating oil - internal leakage generates heat; check pump and cooler.
• Oil leaks - failed shaft or cover seals; replace with heat-resistant seals.
• Low system pressure - check the main relief valve setting and pump output together.

7. Maintenance & Service Tips

• Keep hydraulic oil clean (ISO 4406 cleanliness class) - contamination is the #1 cause of pump wear.
• Change hydraulic oil and filters at the intervals in the Cat maintenance schedule; use the correct oil grade.
• Check pump inlet and suction filter regularly - restricted suction causes cavitation damage.
• Monitor oil temperature and system pressure; a sudden change is an early warning sign.
• During replacement, verify the spline teeth (13T / 15T) and coupling condition before installation.

8. Buying Guide: What to Check Before Buying

• Machine identification: exact model (336, 336D2, 340, etc.) and machine serial number.
• Old pump part number: read the plate on the failed pump and match 568-3006 / 568-3007.
• Spline type: count the teeth (13T or 15T) on the old unit or coupling - mismatched splines will not fit.
• Quality tier: choose genuine, OEM, aftermarket or rebuilt based on machine age and budget.
• Logistics: confirm weight and packing with the supplier to plan air vs sea freight.
• Warranty & support: confirm warranty terms, lead time and after-sales support before payment.

9. Real-World Case Study: CAT 336 Hydraulic Pump Supply (Export Project)

RITO HYDRAULIC supplies complete CAT 336 / 340 main pumps (568-3006 / 568-3007) built for direct bolt-on replacement. Key product data: precisely matched spline interface (13T or 15T), stable volumetric efficiency under high pressure, and wear- and heat-resistant seals for lower leakage and downtime risk.

Based on our export experience, buyers replacing a failed 336 pump should confirm four things before ordering: the machine model and serial number; the part number on the failed pump; the spline tooth count (13T or 15T); and the quality tier with warranty terms. With these confirmed, the correct unit ships quickly and installs without modification - getting the excavator back to work with minimal downtime.

10. FAQ - CAT 336 Hydraulic Pump

Q1: What hydraulic pump fits the CAT 336?

The main pump for the CAT 336 / 340 family is supplied under part numbers 568-3006 / 568-3007, with 13T or 15T spline options for direct bolt-on installation.

Q2: What is the difference between 13T and 15T spline?

The number refers to the spline teeth on the pump input coupling that connects to the engine gear train. You must match the tooth count of your original unit - a 13T pump will not fit a 15T coupling.

Q3: How much power does the CAT 336D2 have?

The 336D2 uses a Cat C9 ACERT engine delivering approx. 201-209 kW (270-280 hp) net power, with an operating weight of approx. 34,600 kg.

Q4: What are the symptoms of a failing main pump?

Weak digging force, slow swing or travel, abnormal pump noise, overheating hydraulic oil, external oil leaks, and low system pressure are the most common warning signs.

Q5: Is the RITO pump a direct bolt-on replacement?

Yes. The pump features a precisely matched spline interface for direct installation with no modification, reducing labor and downtime.

Q6: Genuine or aftermarket - which should I choose?

Genuine parts offer the longest warranty at the highest price; quality aftermarket pumps provide verified fit at a competitive price - a good choice for older machines. Confirm the quality tier and warranty before ordering.

Q7: How much does a CAT 336 hydraulic pump cost?

Price depends on the quality tier (genuine / OEM / aftermarket / rebuilt), the spline version and shipping. Contact RITO HYDRAULIC with your machine model and old part number for an exact quote.

Q8: How often should I service the hydraulic system?

Follow the Cat maintenance schedule for hydraulic oil and filter changes, and monitor oil cleanliness. Contaminated oil is the leading cause of premature pump failure.

Q9: How do I confirm the right part number?

Read the part number plate on your failed pump (e.g., 568-3006 / 568-3007) and check the machine model and serial number with your supplier before ordering.

Q10: Where can I buy a CAT 336 hydraulic pump?

RITO HYDRAULIC supplies CAT 336 / 340 main pumps with verified part numbers, spline options, warranty and export packing. Send your machine model and old part number for a quote.

11. Conclusion: Get the Right 336 Pump for Your Machine

The CAT 336 hydraulic pump (568-3006 / 568-3007) is a direct-fit, high-performance replacement for the 336 / 340 excavator family. Confirm your machine model, old part number and spline type (13T or 15T), choose the right quality tier, and your machine will be back to full digging power with minimal downtime. RITO HYDRAULIC offers verified fit, transparent warranty and fast export shipping - contact us today for a quote.