Hydraulic Warranties & Repairs

Contamination is a common problem that causes reduced performance and wear within a hydraulic pump or motor. Dirt particles, moisture, and chemicals cause damage as well, and sometimes the wrong fluid accelerates wear. However, worn cast-iron gear, piston, and vane pumps and motors can often be repaired, which is often faster and more affordable than replacing hydraulic equipment.

Normally, as long as the housing can be reused, White House Products Ltd can economically repair hydraulic piston and vane pumps or motors. All units are fully tested before being returned to the customer.

We do not charge to collect, disassemble, or provide a quote for repair. If you have a failing hydraulic pump or motor, contact White House Products, Ltd, or log in to your account and get your hydraulic repair service quote free of charge.

Signs You Need Hydraulic Pump or Motor Repair

With our expertise in hydraulic products from leading manufacturers, we are familiar with the most common types of repairs. You should consider repairs if you notice the signs listed below.

Hydraulic Pump Symptoms

• Hydraulic fluid leaks—external or internal
  Liquid on the outside of the pump is the easiest to spot and usually points to a failed shaft seal, front cover gasket, or loose fittings. Leaks can also occur inside a hydraulic unit—worn wear plates, gears, bearings or bodies, cracked housings, or damaged hydraulic valves allow oil to bypass rather than build pressure. Any leak reduces the flow  available at system pressure and speeds up wear until the pump deteriorates.
• Unusual noise
  Pumps are engineered to run smoothly. Banging and knocking often indicate aeration—air drawn in on the suction side that you may also see as foamy oil in the tank. A high-pitched whine or “scream” suggests cavitation—vapour bubbles forming and collapsing in low-pressure zones—which is highly destructive to internal surfaces. Typical root causes include low oil level, a restricted or collapsing suction hose, a blocked suction strainer, or a leaking shaft seal.
• System is slow on all functions
  If cylinders and motors are uniformly sluggish, the pump may no longer deliver its rated flow. Check drive speed and coupling condition. On variable piston pumps, rising case-drain flow at a fixed pressure set-point is a strong indicator of internal leakage due to valve plate and / or rotating group wear.
• Pressure falls as temperature rises
  As oil thins with heat, a worn pump will bypass more internally. You’ll see pressure decay under the same load. If the relief valve is sound, suspect increasing clearances in gears, vanes, or the rotating group.
• Localised overheating at the pump body
  A noticeably hotter pump case points to wasted energy inside the unit. On piston pumps, it’s important to ensure the case-drain returns freely to the tank below oil level and that any specified flushing flow is present. Persistent hot spots mean efficiency loss and impending failure.
• Filter and inlet issues—starvation and blockages
  Blocked filters and crushed or soft suction hoses restrict pump inlet flow, triggering cavitation and rapid wear and tear. It’s important to replace clogged elements and ensure the suction line is correctly sized and routed.
• Foamy oil in the reservoir
  Foam confirms air ingress. Tiny bubbles compress and expand with every pump stroke—noise rises, volumetric efficiency falls, and the machine feels “spongy”.
• Oil at the shaft seal or front cover
  A failed seal is often a symptom. Look for misalignment, contaminated oil, over-pressurised case drains, or shaft wear.

When heat won’t come down

Performance degrades at sustained oil temperatures above 100–120°C. If you’ve already addressed oil grade, cooling airflow, and restrictions, yet the system still runs hot, the pump may be converting too much input power into heat—in which case, it’s time to contact White House Products Ltd.

Hydraulic Motor Symptoms

• Low torque or stalling at normal pressure
  If supply pressure is in spec but the motor will not turn or feels weak, internal leakage is likely. Worn gearsets or rotating groups let hydraulic oil bypass instead of producing torque.
• Speed is erratic or surges under steady flow
  Hunting speed often traces to contamination scoring, uneven wear, or restricted case-drain that aerates the housing. Sticking directional or flow-control valves can compound the problem.
• Creeping when the drive should hold position
  Cross-port leakage lets the shaft drift under load—common on winches, slews, and conveyors. Inspect the motor for internal bypass, then assess counterbalance and load-holding valves for leakage or incorrect settings.
• Excessive case-drain flow and localised heat
  Rising drain flow at a steady pressure signals internal bypass. Expect warmer housing temperatures and reduced efficiency. Compare case-drain measurements to the maker’s typical values for the motor model and duty.
• Unusual noise under load
  Growling or rumbling as torque is applied suggests bearing distress or damaged wear plates. Inlet restrictions can also trigger load-dependent cavitation noise. Continued use risks shaft or spline damage.
• Shaft play, wobble, or front-face leaks
  Detectable radial or axial movement points to bearing failure or misalignment with the driven load. Seal life shortens and port-face joints may leak.
• External or internal fluid leaks
  As with pumps, leaks reduce available pressure and raise heat. Look for damaged gaskets or O-rings, pressure spikes, or distorted mounting faces. Internal leakage will show up as torque loss, drift, and overheating.
• Filter and contamination warnings
  Blocked return or pressure filters starve the motor of clean oil and can create pressure drops that affect speed and torque. Persistent clog alarms point to upstream contamination or component wear that needs attention.

Quick pre-checks before condemning a unit

Verify oil level and grade, clear any blocked breathers, confirm relief-valve and flow-control settings, and inspect suction and return lines for restrictions. These simple steps often resolve symptoms that mimic motor failure.

Repair Process

White House Products Ltd employs a very reliable repair process that enables us to quickly and effectively restore hydraulic pumps and motors. Once our repair centre receives your part, we carefully proceed with disassembly, which enables us to access affected components and perform a thorough examination.

Next, our technicians assess which components can be reused, repaired, and replaced, source any parts that are not already in stock, and prepare a full quotation for the customer’s acceptance. All quotations include a full post reassembly test, which is logged for future reference.

We thoroughly clean the parts that can be reused or repaired, eliminating oil buildup and removing other potential contaminants. For motors, electronics are tested to determine other repair needs. Moving parts with scoring, such as pistons, shafts, and cylinders, are replaced, honed, polished, or resurfaced where required. Worn seals, bearings, and gaskets are replaced, and we check the tolerances of all fittings to ensure your hydraulic system supports normal operating pressures.

We service most gear, vane, axial, and radial piston pumps and motors—including orbital/LSHT units and many closed-loop hydrostatic final drives—subject to inspection. Your warranty claim is documented and you receive a clear quotation showing the use of genuine parts or approved equivalents.

As an experienced repair company, we rebuild to high standards, with tolerances reset to specification, and we confirm warranty coverage on dispatch. With our wide-ranging expertise, our team can coordinate everything from hydraulic pipe repair and cylinder repair to seal replacement. We are confident in our ability to ensure you enjoy the benefits of reliable equipment for your application.

Contact White House Products Ltd

When you need a hydraulic pump repaired or a hydraulic motor serviced, you can trust our technicians to carry out a high-quality repair and test. Please always ensure that the unit to be repaired is sent to us as it comes off the machine so our hydraulic repair specialists can reassemble it correctly with all ports in the correct positions.

Work undertaken is covered by a full warranty: should a customer not be happy with the repaired unit, we will collect, examine, and retest. If the unit has been damaged or incorrectly fitted to the machine, then any remedial work will be chargeable. If we have in some way incorrectly refitted parts or find no fault, then there will be no charge.

Call +44 (0) 1475 742500 or contact us online for your free, no-obligation quote and to take advantage of our world-class hydraulic repair centre.

PLEASE ENSURE ALL PARTS ARE CLEANED AND DRAINED OF OIL, WITH FITTINGS REMOVED, BEFORE SENDING