Compact Excavator Hydraulic Pump Replacement Cost: Cat 308, Komatsu PC88, Bobcat E88, and More

A hydraulic pump failure on a compact excavator (roughly 3 to 8 metric tons) shuts the machine down. Boom, arm, bucket, and travel all run from the same main pump. When it goes, nothing works at full speed, and the machine earns nothing until the pump is replaced. Here is what the repair costs on the most common compact excavators in North America, and what you need to know before you approve the job.

Compact Excavator Hydraulic Pump Replacement Cost

A hydraulic pump replacement on a compact excavator in the 3 to 8 ton class runs $3,200 to $11,000 all in, parts and labor. The range is wide because machine size, parts sourcing, and contamination scope all vary considerably. The table below covers the realistic range by machine class.

Machine Class	Labor Hours	Parts Cost	Total Estimate
Small compact (3-4 ton)	5-8 hrs	$2,200-$4,500	$3,200-$6,500
Mid-compact (4-6 ton)	6-10 hrs	$3,000-$6,000	$4,500-$8,500
Upper compact (7-8 ton)	6-12 hrs	$4,500-$8,000	$6,000-$11,000

Ranges cover remanufactured units through OEM new. Add $500-$1,500 for system flush and contamination inspection if the pump shed internal metal. Shop rates of $90-$140/hr assumed.

The compact class uses tandem variable-displacement axial piston pumps. These are more complex and more expensive than the gear pumps or single-displacement units found in mini excavators under 3 tons. Labor time is also higher because the pump assembly is larger and access through the engine compartment requires more disassembly than on smaller machines. Get a machine-specific estimate before calling shops: EquipBook's free repair cost estimator covers hydraulic pump replacements across this class.

Cost by Brand and Model

• Caterpillar 308 / 308E2 / 309: $5,500-$9,500 total. Cat 8-ton compact excavators use heavy-duty tandem piston pumps that support both implement and drive circuits. OEM Cat pump assemblies carry a significant premium, but quality reman units from recognized suppliers are available at 35-50% below OEM. The 308 is a high-volume machine with solid aftermarket support. Expect 7-12 hours of labor at a Cat dealer; independents experienced with Cat compact excavators typically run 6-9 hours.
• Caterpillar 310 / 311: $6,500-$10,500 total. The 310 and 311 approach the upper boundary of the compact class. Pump replacement follows the same process as the 308 but the pump assembly is larger and heavier. Labor runs 8-12 hours at most shops. Strong Cat dealer network supports parts availability nationwide.
• Komatsu PC88MR / PC78US: $5,000-$9,000 total. Komatsu compact excavators use well-supported hydraulic systems with good reman availability through Komatsu's own remanufacturing program. The PC88MR is a common mid-compact machine. Komatsu's short-tail-swing and zero-swing designs have slightly different access configurations that can affect labor time, but Komatsu shops handle these routinely.
• Bobcat E85 / E88: $4,500-$8,500 total. The E85 and E88 are Bobcat's upper compact excavators, used heavily in site prep, utility, and landscaping. Bobcat's service network is broad and aftermarket pump support is solid. The E88 at 8.7 tons is near the top of the compact class. Bobcat compact excavator pumps are robust but show faster wear when machines run breaker attachments heavily without hydraulic cooler upgrades.
• Hitachi ZX75 / ZX85: $5,000-$9,500 total. Hitachi compact excavators have a loyal following in the rental and production sectors. The ZX85 is a workhorse machine with solid parts support. Hitachi OEM pumps carry a premium, but the reman market for Hitachi compact excavator pumps has grown significantly and quality units are available. Hitachi/John Deere platform sharing supports broader parts sourcing in some cases.
• Doosan DX85R / DX63: $4,500-$8,500 total. Doosan (now DEVELON) compact excavators have a strong U.S. dealer presence. The DX85R is a zero-tail-swing 8-ton machine common in tight-access utility and urban construction work. Parts availability is solid; the reman pump market for Doosan compact excavators has expanded as the U.S. fleet has aged.
• Kubota KX080-4 / U55-4: $4,500-$8,000 total. Kubota's upper compact lineup uses reliable hydraulic systems with strong dealer coverage. The KX080 at 7.8 tons is near the upper limit of the compact class. Kubota's reman program and active aftermarket supplier base keep parts costs competitive. Well-maintained KX080s regularly reach 10,000-12,000 hours before the pump needs replacement.

Why Compact Excavator Hydraulic Pumps Fail

The leading cause is contaminated hydraulic fluid. Compact excavators work in dirt and debris environments, and hydraulic fluid contamination from a failed filter, improper fluid change, or water ingestion accelerates internal wear on piston slippers and valve plates. Changing hydraulic fluid and the return filter on schedule is the single most effective maintenance item for pump longevity.

Cavitation is the second most common cause. It happens when the pump tries to move fluid faster than the suction line and tank can supply it. A clogged suction strainer, a partially closed suction valve, or operating in very cold weather before the fluid reaches operating temperature all create cavitation conditions. The symptom is a high-pitched whining or chattering sound from the pump under load. Cavitation leaves pitting damage on the pump's internal components and accelerates bearing wear.

High-hour wear is the third cause. On machines running clean fluid and proper service intervals, compact excavator pumps typically reach 8,000 to 14,000 hours before replacement becomes necessary. Machines running breaker attachments, working in abrasive conditions, or with deferred maintenance histories fail earlier.

Signs Your Compact Excavator Pump Is Failing

• All functions slow at once. If boom, arm, bucket, and travel are all slow simultaneously, the main pump is the most likely cause. If only one function is slow, look at the control valve, individual cylinder, or drive motor for that circuit instead.
• Whining or moaning from the pump compartment under load. Normal pump sound is a steady low hum. A high-pitched whine that gets louder when you load the circuit is cavitation or early internal wear.
• Hydraulic fluid overheating repeatedly. A pump losing internal efficiency works harder to maintain pressure, generating excess heat. Repeated thermal shutdowns on a machine with a clean cooler and correct fluid level point to the pump.
• Active fault codes for hydraulic pressure or pump output. Modern compact excavators from Cat, Komatsu, Kubota, and Bobcat log hydraulic pressure faults before the pump fails completely. Pull the fault codes before ordering parts. Pressure sensor faults can sometimes mimic pump failure symptoms.
• Metal in the hydraulic filter or fluid sample. When the main pump fails internally, it sends metal particles downstream. A particle count on a hydraulic fluid sample or obvious metal in the spin-on return filter confirms internal pump failure and means the whole circuit needs inspection before a new pump goes in.

The Contamination Risk

On compact excavator hydraulic pump failures, the contamination question matters more than on smaller machines. If the pump shed metal into the system, the control valve block, the swing motor, the travel motors, and the cylinder piston seals have all received that contamination. Installing a new pump into a contaminated circuit destroys the replacement pump within a few hundred hours.

Before approving the pump replacement, ask the shop whether they are flushing the system and inspecting the main control valve. This adds $500-$1,500 to the job but is not optional on any internal pump failure. If a shop quotes the pump but does not mention the contamination protocol, that is a red flag.

OEM vs. Remanufactured vs. Aftermarket

• OEM new: Highest cost. Correct pressure and flow specs, manufacturer warranty, guaranteed fit. Right choice for low-hour machines still early in their service life or any machine under active dealer warranty.
• Remanufactured (reman): 30-50% below OEM. Rebuilt to original tolerances with new bearings, seals, and wear components. Most carry 6-12 month warranties. The right call for the majority of out-of-warranty compact excavators in good running condition. Verify the unit is matched to your specific pump serial number, not just the model name.
• Aftermarket: 40-60% below OEM. Quality varies significantly by supplier. Use a supplier that lists your specific OEM part number, not just operating weight or general flow rating. A pump with slightly wrong relief valve settings or different port orientation can cause immediate damage or slowly reduce machine performance.

Does the Repair Make Sense?

A 2021 Cat 308E2 in good condition is worth $115,000 to $145,000. A $7,500 pump replacement is 5 to 6 percent of that value. On any compact excavator under 6,000 hours with a clean frame, solid undercarriage, and no other major deferred maintenance, a pump replacement is a straightforward call.

On a 2014 Komatsu PC88MR at 11,000 hours with worn undercarriage and a damaged cab, the math requires more thought. Know the market value of your machine before you commit to a major repair.

Run a free compact excavator valuation at EquipBook in under 60 seconds. Then use the free repair cost estimator to price the hydraulic pump job on your specific machine. Those two numbers together tell you whether to approve the repair, get a second quote, or look at replacement.

See also: mini excavator hydraulic pump replacement cost for machines under 3 tons, compact excavator final drive replacement cost, and full-size excavator final drive replacement cost for repairs on larger machines.