Boom or bucket drifts down on its own
A cylinder that has lost its seal, or a holding valve leaking past. It gets worse under heat and load. Left alone the rod scores the barrel and a reseal turns into a new cylinder.
Hydraulics · Field service
Hydraulic RepairSlow, weak and leaking is not something you live with.
Cylinders, pumps, control valves, hoses and fittings. Boom drift, cycle times that have doubled, a machine that will not lift what it used to, and the leak that keeps coming back.
Phone answered 24/7. Based in St Johns, working fifteen towns across eleven counties.
Hoses
Made on site
Pressure + Flow
Measured, not guessed
Field First
Most repairs on site
24/7
Phone answered
What this is
Hydraulic Repair across Northeast Florida.
Hydraulic problems get tolerated far longer than they should, because the machine still moves. It just moves badly. The cycle times creep up, the operator compensates, and everybody accepts that this machine is a bit tired now. Meanwhile the pump is eating itself and the bill is growing.
The diagnosis is not complicated but it does require instruments. Pressure at the right test port, flow under load, case drain volume, temperature. Those numbers tell you whether you are looking at a worn pump, a relief valve stuck low, a leaking cylinder, a clogged suction screen or a control problem. Without them you are buying parts and hoping.
Most of this work happens in the field. Hoses get made at the truck, cylinders get resealed on site where access allows, and pumps and valves get swapped or repaired depending on what the machine and the schedule need. Contamination control is the part nobody sees and the part that decides whether the repair holds.
Dirt is the enemy, not wear. Most hydraulic components do not die of old age. They die because something got into the oil. Open a system carelessly in a dusty yard and you have built the next failure into the repair.
At a glance
- Service
- Hydraulic Repair
- Where
- On site and in the shop
- Phone
- (904) 496-2937
- Hours
- Answered 24/7
- Base
- St Johns, FL 32259
- Coverage
- 15 towns, 11 counties
Diagnostics
Signs the hydraulics need work
Six things we hear on the phone most weeks, and what each one usually turns out to be.
Everything got slow
Cycle times creeping up across the whole machine usually means pump wear or a relief valve that is no longer holding pressure. If one function is slow and the rest are fine, look at that circuit instead.
Weak breakout force
The machine still moves but it will not dig, lift or push what it did last year. Pressure is down somewhere. Measuring it takes minutes and tells you whether it is the pump, a relief or a leak inside a cylinder.
Oil is hot, foamy or milky
Heat means the system is doing work it should not have to. Foam means air is getting in on the suction side. Milky means water. All three shorten component life fast and all three have findable causes.
A hose that keeps failing
Once is bad luck. Twice in the same spot is chafing, wrong routing, wrong pressure rating or a fitting that does not belong there. Replacing it a third time is a choice. What to do when a hydraulic hose blows.
Whining, screeching or a hammering noise
Cavitation on the suction side, a plugged filter or screen, or low fluid. A pump that is cavitating is destroying itself right now, so shut it down rather than finishing the shift.
The work
How a hydraulic job goes
Nail down which circuit
One slow function is a different problem to a whole slow machine. Which movements are affected, and under what load, narrows it before anyone touches a fitting.
Measure pressure and flow
At the correct test ports, under load, at operating temperature. This is the step that separates a repair from a parts-swapping exercise.
Check the cheap causes first
Fluid level, filter condition, suction screen, breather, relief setting. A surprising number of expensive-sounding hydraulic complaints end here.
Repair or replace, and say which
Cylinders reseal, pumps sometimes rebuild and sometimes do not, valves usually come apart and clean up. You get told the honest economics of each on your machine.
Keep the system clean
Capping lines, clean fittings, filtered fill, new filters after the repair. This is the difference between a fix that lasts and a repeat visit.
Flush, bleed and test
Air out, temperature up, cycle everything, recheck pressures under load. Then confirm the numbers moved to where they should be.
Equipment
What comes out for hydraulic work
- Hose crimper with hose and fitting stock
- Pressure gauges and test port fittings
- Flow meter for pump testing
- Cylinder seal kits and seal tooling
- Clean fluid and filtration
- Caps, plugs and clean fittings
- Rigging for pump and cylinder removal
Making hoses on site is the whole point. A blown line on a Friday afternoon should be an hour, not a weekend spent waiting for a parts counter to open on Monday.
Coverage
What we work on.
Machines and engines
ExcavatorsMini excavatorsDozersWheel loadersTrack loadersSkid steersBackhoesTelehandlersForestry mulchersDump trailersService cranesTractors
Systems and components
CylindersMain pumpsControl valvesRelief valvesHoses and fittingsCoolersFilters and screensSwing motorsAuxiliary circuitsQuick couplers
Mobile versus hauling it in
What a haul to the shop really costs you.
The repair bill is the part everybody looks at. It is usually not the expensive part. Run your own numbers down this list before you call a hauler.
| Line item | Haul it to a shop | Mobile repair on site |
|---|---|---|
| Transport | Lowboy both ways, plus a permit if it is oversize | None |
| Loading time | Machine and operator tied up on both ends | None |
| Crew downtime | Days, not hours, and they are still on payroll | Hours in most cases |
| Schedule | You wait for a hauler and then a shop slot | You wait for one truck |
| Rental replacement | Often needed to keep the job moving | Usually not |
| Liquidated damages | Possible if the job has a completion date | Usually avoided |
Some jobs are still shop jobs. A crank that needs to come out is not getting
done in the sand no matter who tells you otherwise. The point is that most of them are not that job, and
nobody should be hauling a machine across the county for a hose, a sensor or a starter.
How a call goes
How mobile equipment repair works.
STEP 01
You call
Tell us the machine, the symptom and where it sits. We ask a few questions so the right parts come with us.
STEP 02
We tell you straight
Field job or shop job, and roughly when we can be there. If we are too far out to help today, you hear it on the first call.
STEP 03
We diagnose on site
Pressures, codes, readings. You get the actual cause and a number before a wrench turns on the repair.
STEP 04
Back to work
We fix it, test it under load and clean up. You get told what failed and what to watch so it does not happen twice.
Emergency heavy equipment repair?
Call. Do not fill in a form and wait. The phone is answered around the clock and you will get an honest answer on that first call about whether we can reach you in time to do any good.
Have this ready when you call
- Make and model of the machine, truck or engine
- What it is doing, in your own words
- Any codes showing on the dash
- Where it sits and how a service truck gets to it
- Whether it can be moved at all
- A number that gets answered on site
Questions we get
Hydraulic Repair questions.
Can you make hydraulic hoses on site?
Yes. The truck carries hose and fittings and a crimper, so a blown line usually gets made and fitted the same visit rather than waiting on a parts counter.
My boom drifts down. Is that a cylinder or a valve?
It is one or the other and there is a test that tells you which. Isolating the cylinder from the holding valve shows whether the fluid is passing the piston seal or leaking through the valve. Guessing between them means buying the wrong part half the time.
The machine is slow but nothing is leaking. What now?
Pressure and flow readings. Slow across every function usually means pump wear or a relief valve that is no longer holding. Slow on one function points at that circuit. Either way it is measured, not assumed.
Can a hydraulic pump be rebuilt or does it have to be replaced?
Depends on the pump and how far it went. Some rebuild economically, some do not, and a pump that failed because of contamination will just fail again if the cause is still in the system. We will tell you which situation you are in.
What does milky hydraulic oil mean?
Water in the system, usually through a bad breather, a failed cooler or a cylinder seal drawing in moisture. It has to be found and fixed, because water destroys pumps and valves quietly and quickly.
How often should hydraulic oil and filters be changed?
Follow the machine's own service interval, and shorten it if the machine works hot, dusty or hard. If a major component has failed, the oil and every filter get changed regardless of hours, because the debris from that failure is still circulating.
Do you work on hydraulic attachments too?
Yes. Breakers, thumbs, grapples, augers, mulching heads and the auxiliary circuits that feed them. Attachment plumbing and flow settings are a common source of complaints that get blamed on the machine.
Is a leak really urgent?
A weeping fitting is not an emergency. A leak that is losing measurable fluid is, because running a pump low is how you turn a fitting into a pump. And on a job site, hydraulic oil on the ground is a problem of its own.
Related services
Hydraulics touch most of the machine. These are the pages next door.
Where we do this work
Machine down
Call it in and get a truck rolling.
Tell us the machine, the symptom and where it sits. If we can help, you will know on the first call. If we cannot get to you in time to do any good, we will say that too.
(904) 496-2937
East Coast Diesel & Marine
Mobile heavy equipment, diesel and marine repair
Serving Northeast Florida and Southeast Georgia
Based in St Johns, FL 32259
(904) 496-2937 · eastcoastdiesel904@gmail.com
Hours: phone answered 24 hours, 7 days
Mobile heavy equipment, diesel and marine repair
Serving Northeast Florida and Southeast Georgia
Based in St Johns, FL 32259
(904) 496-2937 · eastcoastdiesel904@gmail.com
Hours: phone answered 24 hours, 7 days