Industrial Hydraulic Pump Repair for Presses & Injection Molding

When a press, injection molding machine, machine tool or power unit loses its pump, the fastest way back to production is usually an exchange unit or a rebuild of the pump you already have, built to factory specification and function-tested. RestoPower rebuilds and supplies parts for the pumps these machines run on: Vickers PVH, PVB, PVQ, PVM and vane pumps, Denison T6 and T7 vane pumps and Gold Cup piston pumps, Rexroth A10VSO, Oilgear and Racine.

A plant does not lose a pump, it loses a line. That is why the questions that matter here are how long the machine will be down and what gets it back soonest, not just what the rebuild costs.

The short version: free teardown and evaluation, a firm, itemized quote you approve before any billable work, rebuilt to factory specification and function-tested, and, for work done in our shop, a 1-year repair warranty. Exchange where we have a rebuilt unit on the shelf. In-stock parts ship within 24-72 hours and carry a 2-year warranty.

Our shop or our repair network. Your pump is repaired either in our shop in Lake Orion, Michigan, or through the RestoPower repair network, when a network shop closer to you can turn it around faster. We arrange getting the pump to the shop doing the work and tell you which shop before any work starts. The price, turnaround and warranty for a network job are confirmed on your quote.

Which industrial hydraulic pumps do you rebuild?

These are the pump families we see most from presses, molding machines, machine tools and central power units. The middle column is where each manufacturer's own literature puts the product. It is background, not a fitment list.

Pump family	Where the factory literature puts it	Parts and service data
Vickers PVH piston pumps	Eaton lists metal-forming equipment, hydraulic power supplies, presses, factory automation and machine tools as industrial applications.	PVH parts catalog, PVH parts
Vickers PVM piston pumps	Eaton lists metal forming, tube bending, machine tools, precision sawing, factory automation, presses and power supplies.	PVM catalog, PVM parts
Vickers PVB and PVQ piston pumps	Eaton lists factory automation and hydraulic power supplies for both, plus food processing machines and machine tools for the PVQ.	PVB catalog, PVQ catalog
Vickers V, VQ and VMQ vane pumps	Eaton calls the V series the most popular medium pressure industrial fixed pump, and lists high-pressure plastic injection molding machines and large press machines for the VMQ.	Vickers vane pumps, VMQ parts, vane pump seal kits
Denison T6 and T7 vane pumps	Single, double and triple fixed vane pumps (T6C, T6CC, T6DCC and the rest of the family), with factory service information for each.	Denison T-series catalog, T6C parts
Denison Gold Cup piston pumps	Parker describes Gold Cup for hydrostatic transmission work in marine, drilling and shredding, and the Denison division for in-plant machines such as machine tools, plastic molding, die casters and stamping presses.	Gold Cup pumps, P6 / P7 / P8 parts
Rexroth A10VSO piston pumps	Rexroth's data sheet calls the A10VSO an all-purpose medium pressure pump for open circuits, suitable for mineral oil and HF fluids.	A10 rebuild service, A10VSO parts
Oilgear PVWJ, PVG and PVWH piston pumps	Oilgear's PVWJ bulletin highlights operation on water-base, low viscosity and other special fluids, and its PVG brochure says the PVG builds on the PVWJ's industrial pump ideas.	Oilgear, PVWJ parts, Oilgear seal kits
Racine vane and piston pumps	PVQ, PVB, PVS and PVF vane pumps and C4, C5, C11, 20H and 80M piston pumps.	Racine parts catalog

None of that tells you which pump a particular press or molding machine shipped with, and we do not guess. Machine builders often ordered pumps with their own controls, shafts or seal options. The pump's own tag decides the parts.

Rebuild, exchange or new: which gets the machine running soonest?

On a production machine, compare options on downtime first and price second. A cheaper fix that keeps the line down longer is rarely cheaper.

Option	What you get	When it is the right call
Exchange	Where we have a rebuilt unit on the shelf, you get it now and send your core back after	The machine is down and every shift costs more than the pump. Least downtime of any option.
Rebuild your pump	Full teardown, every seal and wear part replaced, worn surfaces machined or replaced, rebuilt to the original specification and function-tested	The housing and shaft are serviceable, or the pump carries a special control or option that a replacement would not match.
Rebuild a spare	Your old pump rebuilt and put on the shelf after a new or exchange unit goes in	A critical press or molding machine, where the next failure should be a pump swap, not a search.
Seal kit or parts only	The correct seal kit, cartridge or wear parts for the series and code	Your maintenance team has the bench and the pump only needs seals or a vane cartridge.
New pump	A replacement unit, where one is still available	The housing is cracked or the shaft and bore are past saving, or a new pump is the fastest way back.

Our opinion: if one machine carries the plant, keep a rebuilt spare for it. A pump on the shelf is the cheapest downtime insurance there is, and older pumps in particular get harder to source every year. If a pump is not worth rebuilding, we say so and quote a replacement instead. The money side is covered in what hydraulic pump repair actually costs.

What fails on press and injection molding pumps?

Industrial pumps run long hours at electric motor speed, so they wear out rather than break. These are the patterns we see, and the check that tells you whether it is the pump at all.

What you notice	Usual cause	Check first
Cycle time creeps up, the press will not make tonnage, the molding machine is slow to fill	Internal wear in the rotating group, valve plate or vane cartridge, or a compensator set wrong	Case drain flow and compensator setting. See case drain flow test.
Pressure hunts, will not hold, or the pump runs hot while the machine is idle	The pressure compensator: spool, springs or a wrong setting	Vickers compensator adjustment or A10VSO compensator adjustment
Whine, rattle or a gravel sound	Cavitation or aeration on the inlet side	Suction strainer, inlet line, oil level and viscosity. See pump noise and cavitation.
Oil temperature keeps climbing	Oil slipping across worn clearances, a relief valve blowing over, or a cooler problem	See why a hydraulic pump overheats.
Vane pump loses pressure but still makes flow unloaded	A worn cartridge: ring, rotor, vanes and side plates	See vane pump cartridge kit rebuild.
Oil at the shaft or in the bellhousing	Case pressure pushing the lip seal, or a grooved shaft	Case drain line routing. See shaft seal leaks.

Check the system before you condemn the pump. A relief valve set low, a stuck directional valve or a leaking cylinder will make a healthy pump look tired, and a rebuilt pump will not fix any of them.

How do I identify an industrial pump for a quote?

Read the full model code off the tag, every character. The control code and design number in it decide the parts as much as the frame size does. These pages decode the common ones:

Also tell us what fluid the machine runs. Plants running fire-resistant fluids need seals to match, and the wrong elastomer fails fast. Our hydraulic seal materials guide and seal codes by brand cover the options.

How does an industrial pump repair job work?

Tell us what you have. Send the model code or a photo of the tag through request a quote, or call. Say whether the machine is down, so we can tell you whether an exchange unit is available. We arrange getting the pump to the shop doing the work.
Free teardown and evaluation. The pump is taken apart, the wear parts measured and the cause of the failure identified, at no charge.
Firm, itemized quote. You approve the price before any billable work starts. If the pump is not worth rebuilding, we say so and quote a replacement.
Rebuild and test. Rebuilt to factory specification and function-tested before it ships.
Back into the machine. Work done in our shop carries a 1-year repair warranty. For a network job, the warranty is confirmed on your quote.

Replacing the pump outright? The core buyback program takes worn and damaged pumps for credit.

What should we do before the rebuilt pump goes back in?

Find what killed the old pump and fix it, or the rebuilt one follows it. Change the filters, check the oil, and if the old pump came apart, clean the reservoir and flush before start-up. Fill the case, follow the start-up procedure, then set the compensator to the machine's requirement with a gauge, not by counting turns.

Do not put a rebuilt pump into dirty oil. Debris left from the failed pump can destroy the new one in minutes, and that failure is not covered by any warranty.

Frequently asked questions

Do you repair hydraulic pumps for injection molding machines and presses?

Yes. We rebuild the pump families these machines commonly run, including Vickers PVH, PVB, PVQ, PVM and vane pumps, Denison T6, T7 and Gold Cup pumps, Rexroth A10VSO, Oilgear and Racine, in our shop in Lake Orion, Michigan, or through the RestoPower repair network. The teardown evaluation is free and you get a firm, itemized quote before any billable work.

What is the fastest way to get a down machine running again?

An exchange unit, where we have a rebuilt pump on the shelf. You get the rebuilt pump now and send your core back after. If no exchange unit is available, a rebuild of your own pump or a new pump may be quicker, and we will tell you which when we quote.

Is it worth rebuilding an older industrial pump?

Usually, if the housing and shaft are serviceable. Older pumps often carry controls or options a current replacement does not match, and a rebuild keeps them. If the housing is cracked or the bore is past saving, we say so and quote a replacement instead.

Should we keep a spare pump for a critical press?

For a machine that carries the plant, we think so. A rebuilt spare on the shelf turns the next failure into a pump swap instead of a search, and older pumps get harder to source every year. Send us the old pump to rebuild as the spare once the replacement is in.

Can you rebuild a pump that runs fire-resistant fluid?

Tell us the fluid when you request the quote. Fire-resistant fluids can call for a different seal material than mineral oil, and the rebuild has to use the right one. Our seal materials guide covers which material goes with which fluid.

What warranty comes with an industrial pump rebuild?

Repair and rebuild work done in our shop carries a 1-year repair warranty on the rebuilt pump and the labor in it. For a job handled through our repair network, the warranty is confirmed on your quote. Parts bought from our catalog are separate: in-stock parts carry a 2-year warranty and ship within 24-72 hours.

Do you sell parts if our maintenance team does the rebuild?

Yes. We carry seal kits, vane cartridges and wear parts for Vickers, Denison, Rexroth A10VSO and Oilgear pumps. Send the full model code and we reply with price, availability and lead time.

Line down? Send us the pump code.

Tell us the model code from the tag, what the machine is doing and whether it is down right now. We check for an exchange unit, arrange getting your pump to the shop doing the work, tear it down free and send a firm, itemized quote before any billable work. For parts, we reply with price, availability and lead time.

Request a quote · (810) 882-1171 · Repair and rebuild service · Core buyback