Construction Hydraulic Services: 24/7 Mobile Repairs, Hoses, Cylinders & Heavy Plant Support
Updated: 24 September 2026
Hydraulic systems power some of the most important functions on construction machinery, from excavator booms and stabilisers to lifting equipment, concrete pumps and attachments. When a hydraulic fault stops the machine, the priority is to identify the problem safely and get the equipment operational again with the correct repair.
Completely Hydraulic provides 24/7 mobile hydraulic engineering support for construction equipment, alongside workshop cylinder and ram repairs, hydraulic hose replacement, diagnostics, valves, fittings, oil and filtration, preventative maintenance and hydraulic system engineering.
Completely Hydraulic supports construction plant with 24/7 mobile breakdown assistance, hydraulic hose replacement, fault diagnosis, cylinder and ram workshop repairs, valves and fittings, oil and filtration, system modifications and planned maintenance. Physical trade counters are located in Harlow, Dagenham, Belvedere and Hayes, with additional mobile engineering support across Birmingham and the West Midlands.
Get Priority Hydraulic Support & Trade Pricing
Jump the queue. Reduce downtime. Pay less for parts, labour and callouts.
✔ Priority response
✔ Lower rates day & night
✔ Trade discounts on parts
✔ 30-day credit terms (approved accounts)
Hydraulic Support for Construction Plant & Machinery
Construction equipment places hydraulic systems under demanding operating conditions. High loads, repeated movement, vibration, dirt, weather exposure and site conditions can all affect hydraulic components.
Equipment we may support includes:
- Excavators and diggers
- Loaders
- Dumpers
- Crane and lifting equipment
- Access platforms
- Concrete pumps
- Mixers
- Piling equipment
- Stabilisers and outriggers
- Hydraulic attachments
- Plant trailers and hydraulic ramps
- Other hydraulically operated construction machinery
Because different machines use different hydraulic circuits and components, the correct repair starts with understanding what has failed and why.
Download Our Construction Hydraulic Services Information
24/7 Mobile Hydraulic Repairs for Construction Sites
A hydraulic breakdown does not always happen somewhere convenient. Construction plant can fail while operating on a building site, infrastructure project, yard or other working environment.
Our mobile hydraulic engineers can attend suitable breakdowns to investigate faults and carry out appropriate on-site work.
Depending on the problem, mobile support can include:
- Hydraulic hose replacement
- Leak investigation
- Hose and fitting identification
- Hydraulic fault diagnosis
- Valve and control assessment
- Fitting and adapter replacement
- Assessment of cylinder or ram problems
- Oil-related checks where relevant to the fault
- Advice on further workshop work where an on-site repair is not appropriate
Many hose and suitable external hydraulic faults can be dealt with on site. A damaged cylinder, rod, bore, gland or other component may require removal and controlled workshop inspection, machining, repair, reassembly and appropriate testing. The correct route depends on the fault and condition of the component.
For emergency breakdown support, call 0800 707 6556.
Construction Hydraulic Hose Replacement
Burst and damaged hydraulic hoses are a common cause of construction machinery downtime.
A failed pressure hose should normally be replaced as a complete suitable hose assembly rather than patched or temporarily repaired for continued normal service.
Correct replacement involves more than matching the outside appearance of the old hose. Factors can include:
- Nominal hose bore
- Pressure requirement
- Hose construction
- Temperature
- Fluid compatibility
- Fitting type
- Thread and connection type
- Assembly length
- Routing
- Minimum bend radius
- Machine movement
- Abrasion exposure
See our On-Site Hydraulic Hose Replacement service.
Never use your hand or fingers to search for a suspected high-pressure hydraulic leak. Escaping hydraulic fluid can penetrate the skin and cause serious injury. Stop and isolate equipment safely in accordance with the machinery and site procedures before investigating a suspected failure.
Why Do Hydraulic Hoses Fail on Construction Equipment?
Construction machinery can expose hoses to severe operating conditions.
Possible causes of premature or repeated hose failure include:
- Abrasion against machine structures
- Incorrect routing
- Excessive bending
- Hose twisting
- Heat exposure
- External impact
- Pressure spikes
- Incorrect hose specification
- Assembly problems
- Contamination
- Age and environmental deterioration
If the same hose repeatedly fails, simply installing another replacement may not address the underlying problem.
See our Hydraulic Hose Failure Causes & Prevention guide.
Hydraulic Cylinder & Ram Repairs for Construction Machinery
Hydraulic cylinders perform critical lifting, pushing, positioning and stabilising functions across construction equipment.
Symptoms of a cylinder problem can include:
- External oil leakage
- Drifting under load
- Reduced force
- Erratic movement
- Damaged or scored rod
- Corrosion
- Seal failure
- Excessive internal leakage
- Physical damage
Importantly, a leaking cylinder does not automatically mean that replacing the seals will solve the problem.
The underlying condition may involve the rod, bore, gland, piston, tube, alignment or other components.
What Happens During a Hydraulic Cylinder Rebuild?
The exact repair depends on the design and condition of the cylinder, but workshop work can involve:
- Initial assessment of the cylinder and reported fault.
- Controlled dismantling where the construction permits repair.
- Inspection of seals and internal components.
- Assessment of the rod for scoring, corrosion, wear or damage.
- Assessment of the tube/bore and other structural components.
- Machining or component replacement where required and practical.
- Seal replacement using components appropriate to the repair.
- Reassembly using suitable procedures.
- Final checks and appropriate testing based on the cylinder, application and known requirements.
See our Hydraulic Ram & Cylinder Repair information.
Repair or Replace a Construction Hydraulic Cylinder?
A failed cylinder does not automatically need to be replaced, but neither is every damaged cylinder economically or technically suitable for rebuilding.
The decision can depend on:
- Extent of damage
- Cylinder construction
- Availability of replacement components
- Condition of the rod and tube
- Repairability
- Machine criticality
- Downtime
- Safety considerations
- Cost of repair compared with replacement
Read Repair or Replace Your Failing Hydraulic Cylinder?
Custom Hydraulic Cylinders for Construction Equipment
Some construction machinery uses cylinders that are obsolete, difficult to source or specific to the machine or application.
Where appropriate, Completely Hydraulic can support hydraulic cylinder manufacture and replacement requirements.
The required cylinder specification can involve factors such as:
- Bore
- Rod diameter
- Stroke
- Closed and open length
- Mounting arrangement
- Ports
- Operating requirements
- Materials
- Seals
- Application and environment
A replacement cylinder should be engineered around the actual application requirements rather than simply described as “OEM or better”.
See our Custom Hydraulic Design & OEM Build Services.
Hydraulic Valves & Controls on Construction Machinery
Hydraulic valves control direction, pressure and flow throughout construction machinery.
A machine that will not lift, lower, hold position or move correctly can appear to have a valve problem, but similar symptoms can be caused by other faults.
Possible areas requiring investigation include:
- Directional control valves
- Pressure-control valves
- Flow-control valves
- Solenoids and electrical controls
- Cartridge valves
- Manifolds
- Pumps
- Cylinders
- Contamination
- Incorrect pressure or flow conditions
Diagnosis should therefore come before unnecessary component replacement.
See our Hydraulic Valve Repair & Replacement service.
Hydraulic Pump Problems on Construction Plant
Symptoms such as slow operation, noise, overheating or loss of performance do not automatically prove that a hydraulic pump has failed.
Potential causes can include:
- Low or unsuitable fluid
- Restricted suction conditions
- Cavitation
- Aeration
- Contamination
- Valve faults
- Internal leakage
- Pump wear
- Filter restriction
- Drive or coupling problems
A systematic diagnosis can help avoid replacing an expensive pump when the actual fault lies elsewhere in the circuit.
See our Hydraulic System Troubleshooting & Diagnostics guide.
Hydraulic Oil, Filtration & Construction Equipment
Hydraulic fluid transfers power while also contributing to lubrication, heat transfer and protection of hydraulic components.
Problems can arise from:
- Incorrect hydraulic fluid
- Solid-particle contamination
- Water ingress
- Excessive temperature
- Fluid degradation
- Poor storage or transfer practices
- Incorrect topping up
- Unsuitable filtration
Oil selection should follow the machine manufacturer’s requirements. An ISO viscosity grade such as ISO VG 32, 46 or 68 describes viscosity and does not by itself define the complete hydraulic-fluid specification.
See our Hydraulic Oil Guide.
Not Sure Which Hydraulic Oil You Need?
Some machines require specialist or OEM-specific hydraulic oil. Using the wrong oil can cause serious damage.
Check Your Oil NowPreventative Hydraulic Maintenance for Construction Plant
Hydraulic maintenance can help identify deterioration before it becomes an unplanned breakdown, but there is no single inspection or replacement interval suitable for every construction machine.
Maintenance planning should consider:
- Manufacturer recommendations
- Operating hours
- Duty cycle
- Site environment
- Machine criticality
- Hydraulic component condition
- Previous failures
- Fluid condition
- Downtime consequences
Useful inspection areas can include hoses, fittings, cylinders, leaks, oil level, filtration indicators, unusual noise, temperature and changes in machine behaviour.
See our Hydraulic Preventative Maintenance service.
Construction Site Hydraulic Safety
Hydraulic systems can contain high pressure and stored energy even when machinery is no longer moving.
Construction-site hydraulic work should take account of:
- Machine isolation procedures
- Stored hydraulic energy
- Raised booms, ramps, buckets and attachments
- Unsupported hydraulic loads
- High-pressure fluid injection risk
- Hot hydraulic fluid and components
- Site-specific safety controls
- Manufacturer procedures
A raised boom, bucket, platform, ramp or attachment can retain stored energy or move unexpectedly if hydraulic pressure is lost. Follow the machine manufacturer’s isolation and mechanical-support procedures before working around hydraulically supported equipment.
Construction Hydraulic Faults: Symptom vs Possible Cause
| Symptom | Possible Areas to Investigate |
|---|---|
| Machine suddenly loses hydraulic function | Hose failure, fluid loss, pump/drive problem, valve/control fault or other system issue |
| Hydraulics become slow | Flow restriction, pump condition, internal leakage, oil viscosity, valve or actuator issue |
| Cylinder drifts | Internal cylinder leakage, valve leakage or wider circuit issue |
| Hydraulic system runs hot | Internal leakage, pressure loss, cooling issue, restriction, fluid condition or operating conditions |
| Pump becomes noisy | Cavitation, aeration, suction restriction, fluid level, viscosity, wear or drive issue |
| Same hose repeatedly fails | Routing, abrasion, heat, movement, bend radius, pressure behaviour or incorrect specification |
Construction Hydraulic Services Across Our Network
Completely Hydraulic supports construction and plant customers through four physical trade counters and its mobile engineering network.
| Location | CH Operation |
|---|---|
| Harlow / Essex | Physical trade counter and hydraulic support |
| Dagenham / London | Physical trade counter and hydraulic support |
| Belvedere / Kent | Physical trade counter and hydraulic support |
| Hayes / Heathrow | Physical trade counter and hydraulic support |
| Birmingham / West Midlands | Mobile hydraulic engineering support — not a CH trade counter |
See our Hydraulic Trade Counter Locations.
Frequently Asked Questions
Do you provide emergency hydraulic repairs on construction sites?
Yes. Completely Hydraulic provides 24/7 mobile hydraulic engineering support for suitable construction plant breakdowns across its service areas. Call 0800 707 6556 for the current response position.
Can you replace a burst hydraulic hose on a digger or excavator?
Where the machine, site and fault allow safe on-site work, a mobile hydraulic engineer can identify and replace suitable failed hose assemblies. Damaged pressure hoses should normally be replaced as complete suitable assemblies rather than patched.
Can hydraulic cylinders be repaired on site?
Some external problems can be assessed on site, but substantial cylinder repairs may require removal and workshop work. Rod, tube, gland, piston and internal damage often need controlled dismantling and inspection before the correct repair can be determined.
Can you manufacture replacement hydraulic cylinders?
Completely Hydraulic supports hydraulic cylinder manufacturing for suitable applications, including cases where an existing cylinder is obsolete, difficult to source or requires a purpose-built replacement.
Why does the same hydraulic hose keep failing on my excavator?
Repeated hose failure can be caused by routing, abrasion, excessive bending, twisting, heat, movement, pressure behaviour, incorrect specification or other installation and operating conditions. The underlying cause should be investigated rather than repeatedly replacing the same hose.
Does a slow hydraulic machine mean the pump is failing?
Not necessarily. Slow hydraulic operation can result from pump problems, internal leakage, restrictions, valve faults, unsuitable fluid viscosity or other system conditions. Diagnosis should be carried out before replacing the pump.
How often should construction machinery hydraulics be serviced?
There is no universal service interval for every hydraulic machine. Maintenance should reflect manufacturer recommendations, operating hours, duty, environment, machine condition, criticality and maintenance history.
Do you have a hydraulic depot in Birmingham?
No. Completely Hydraulic provides mobile hydraulic engineering support across Birmingham and the West Midlands, but its four physical trade counters are located in Harlow, Dagenham, Belvedere and Hayes.
What should I do if a hydraulic hose bursts on site?
Stop the equipment safely, keep personnel away from the affected area and follow the machine and site isolation procedures. Never use your hand to search for a high-pressure leak. For emergency hydraulic assistance, call Completely Hydraulic on 0800 707 6556.
Construction Equipment Down?
For hydraulic hose failures, hydraulic faults and suitable construction plant breakdowns, contact Completely Hydraulic’s 24/7 mobile engineering team.
Related Construction Hydraulic Resources
- Hydraulic Piling Machine Repairs
- Hydraulic Cylinder Maintenance for Construction Equipment
- Hydraulic Ram Maintenance & Repair for Heavy Equipment
- Mobile Hydraulic Hose Maintenance & Safety Guide
- Hydraulic Diagnostics & System Testing