dump trailer hydraulic pump troubleshooting(solution 2023)

dump trailer hydraulic pump troubleshooting(solution 2023)

I have just written about solutions for one of the biggest Dump Trailers problem – hydraulic pump troubleshooting. If you don’t have time for long reading and wanna look for corresponding solution about dump trailer hydraulic pump troubleshooting, here you will find everything in detail – why do pumps fail, repair guide and tips from experts; among many other things.

⚠️⚠️⚠️Prior to performing any inspections &/or tests, which may require the body to be in a raised position, the body must be secured and stabilized to prevent accidental collapse of body and hoist. Body must be unloaded, safety prop must be raised, and depending on the problem, tests, and repairs to be performed, additional blocking &/or chain hoist may also be required to safely secure and stabilize the body from accidental fall.

dump trailer hydraulic pump &/or motor doesn’t run

Problem解决方案
Is there power at the solenoid switch?a. Possible grounding issues. Check for corrosion on battery leads.

b. Check for cut power or ground wires.

c. Is pump/motor grounded to the battery or to the frame of truck?
Ground needs to be directly from battery to get correct current.

d. Is there power coming from the control box? Check for Volts/amps from white wire on solenoid switch.
If no power, check for cut lines, rusty or bad connections at Deutsch connector. Replace control box/cord as needed.
Motor corroded or rusty & cannot make connections?Replace D/C motor
Check solenoid switch to see if it is workingUse jumper wire to go from battery side of solenoid switch to motor side…if motor runs at this point, the solenoid switch is bad…if motor does not run at this point, the D/C motor is bad.
Replace part accordingly.
dump trailer hydraulic pump &/or motor doesn’t run

motor runs,but dump trailer hydraulic pump doesn’t work

ProblemSolution
Is there sufficient oil in the reservoir?If no…fill as needed
On single acting power units, the only problem that it can be is gear is broken in the pump.Replace complete power unit
On a double acting power unit:a.Check to see if coils have continuity
• If they do not…replace the coil(s)


b. Check to see if 4-way valve is activating. If it clicks, the valve is activating but the gear is broken
• Replace complete power unit
Is the control box working correctly?a. Is there current going to the coil/valve?

b. Is there good contact at the Deutsch connector?
but dump trailer hydraulic pump doesn’t work, motor runs

dump trailer hydraulic pump will not lift load

ProblemSolution
Is the pump supplying sufficient pressure?Test pressure to verify pump is supplying correct pressures (“C1” port 3200psi) (“C2” port if double acting unit – 500 psi). Pressure should be within +/- 100 psi.
• If incorrect PSI is found, replace the power unit…there is noadjustment.
Is the motor turning the correct RPM?Step 1: Locate the main wiring harness for your dump trailer motor. This will be a bundle of wires that are connected to each other at one end and run from one side of your vehicle to another. The main wiring harness will likely have several different colors on it, including red, white and black.

Step 2: Disconnect the battery cable from the negative terminal on your vehicle’s battery with a wrench or socket set.

Step 3: Unplug the main wiring harness from its plug on the back of your vehicle’s engine block using pliers or needle nose pliers. If there are any other wires plugged into this plug, unplug them as well before pulling it out of place.

Step 4: Plug one end of your tachometer into this plug and connect the other end to an electrical outlet in your home or garage that has power running through it (for example, if you’re working outside during daylight hours, plugging it into a light socket will work).
dump trailer hydraulic pump will not lift load

symptom possible cause & solutions when you press up or down buttons, solenoid switch only clicks

ProblemSolution
Check to see if it is the motor or solenoid switch that is bad.Use jumper wire to go from battery side of solenoid switch to motor side…if motor runs at this point, the solenoid switch is bad…if motor does not run at this point, the D/C motor is bad

• Replace part accordingly
Possible grounding issuesCheck both power and ground lines coming from the battery for corrosion on ends/connections.
Is the pump grounded to the battery, or to the frame of the truck? It should be grounded directly to the battery.Is the pump getting enough volts or amps to activate the solenoid switch?
Does the battery have enough volts to run the motor?A battery has two main jobs: store electrical energy and provide power to the motor.

If you want to know if your battery has enough voltage to start your car, you can attach a voltmeter (a device that measures volts) across the battery terminals and check the voltage reading. The voltage should be at least 12.5 volts.

If it isn’t, there is a problem with your charging system or alternator. In most cases, this means that the alternator isn’t doing its job or that the battery is dead. Either way, it’s time for a new one!
Check to see if a coil has failedIf on a double acting power unit…coil can be checked by using a continuity tester.

Another possible way to test is to reverse the coils and touch the up button to see if unit comes down.
Is the coil to tight on the valve body?If yes…loosen the retaining nut.
Check to see if screen on “down” valve is dirty or plugged thereby not releasing oil.Remove valve from pump body and clean.

Reinstall valve and try to lower the hoist.
Is the plunger stuck inside valve?Remove the valve from pump body…check to see if plunger is working freely.

If not…replace the valve.
symptom possible cause & solutions when you press up or down buttons, solenoid switch only clicks

oil comes out of breather on top of reservoir when hoist is lowered

ProblemSolution
Does the reservoir have enough oil to open the cylinder all the way on the up stroke?If not…air will get into the system & cause the oil to expand

Fill reservoir accordingly…see installation/operation manual
Is the hoist closing faster than the power unit can pump oil back into the top side of cylinder?Is the hoist closing faster than the power unit can pump oil back into the top side of cylinder?

This can be caused when product is left in the body & hoist is lowered,forcing cylinder to close faster.
oil comes out of breather on top of reservoir when hoist is lowered

can not get any current from control box, symptom possible cause & solutions

ProblemSolution
Are the control buttons bad, or pins in Deutsch connector defective?If so…replace the Control Box
The wire from control box to solenoid switch or coils could be cut, or has been damaged.Replace parts accordingly.
Control box has gotten water in it & contact points are rusty.Replace control box
can not get any current from control box, symptom possible cause & solutions

dump trailer hydraulic pump is pumping oil slower than normal

ProblemSolution
In cold weather area’s…is correct fluid being used?Dexron Automatic Transmission Fluid is recommended for all units…especially when operating in temperatures below 32° Fahrenheit.
Check grounding to make sure motor is turning at full RPM’sCheck the voltage going to the motor. If it’s close to 120VAC, you probably have a bad switch or wiring issue. You may need an electrician to help you troubleshoot this problem.
Check to see if water has gotten in hydraulic fluid and is freezingIf you’re having problems with your hydraulic system freezing, start by checking for leaks. There are two places where you might find a leak: around the steering wheel and in the lines leading up to the steering column.

To get to these areas, you’ll need to take off some of your vehicle’s interior panels (such as those covering the dash). Once these panels are removed, look at all of your lines closely and use a hose nozzle to spray water on them; this will help locate any potential leaks.
Screen on suction tube in reservoir could be getting dirty. How long has it been since hydraulic fluid was changed?If you have not changed the hydraulic fluid in some time, then it is time to do so. If you have not checked the level of fluid recently, then I would suggest doing that as well. It is also a good idea to check for any damage in the hose or fittings that might cause a leak.

If you do find a leak, then it is time to replace any damaged components and fix any other problems that may exist in your system.
Screens on solenoid valve could be getting plugged.Remove valve(s), inspect, & clean
Gear inside pump could be wearing out.Replace complete power unit
pump is pumping oil slower than normal

dump trailer hydraulic motor runs slow

Solution
Check for Grounding Issues
Check motor for water or rust/corrosion
Check motor for bad bearing — Replace D/C motor
Verify battery has enough charge to provide sufficient volts to run motor
dump trailer hydraulic motor runs slow

Identifying Common Problems with Dump Trailer Hydraulic Pumps

Effective troubleshooting of Dump Trailer Hydraulic Pumps begins with recognizing the symptoms and understanding the common issues that can affect their performance. Identifying these problems early can prevent minor issues from escalating into major failures, ensuring continuous operation and extending the lifespan of your equipment.

Symptoms of Failing Hydraulic Pumps in Dump Trailers

  • Insufficient Pressure: One of the first signs of trouble may be a noticeable decrease in hydraulic pressure, which can lead to the dump trailer bed lifting more slowly or not lifting to its full height.
  • Hydraulic Fluid Leaks: Visible leaks from the pump, hoses, or fittings are clear indicators of problems. Leaks can lead to a drop in hydraulic fluid levels, affecting the system’s efficiency and potentially damaging the pump if not addressed.
  • Abnormal Noises: Sounds such as whining, grinding, or squealing from the pump area can indicate internal wear or damage, contamination of the hydraulic fluid, or cavitation within the system.
  • Overheating: Excessive heat from the pump or hydraulic fluid can be a sign of overworking, insufficient fluid levels, or contamination, all of which can degrade the system’s performance over time.
  • Erratic Operation: If the dump trailer bed starts behaving unpredictably, such as jerky movements or difficulty in maintaining a position, it could point to issues with the control valve, air in the system, or worn hydraulic components.

Common Issues Faced by Operators

  • Contaminated Hydraulic Fluid: Dirt, water, or other contaminants in the hydraulic fluid can cause significant damage to the pump and other hydraulic components, leading to inefficiency, overheating, and potential failure.
  • Wear and Tear: Regular use naturally leads to wear on the hydraulic pump and its components. Worn seals, damaged gears, or scored pistons can reduce the system’s effectiveness and reliability.
  • Air and Moisture in the System: Air bubbles or moisture in the hydraulic fluid can lead to cavitation and corrosion, respectively. Both conditions can cause damage to the hydraulic pump and system, leading to decreased performance and lifespan.
  • Electrical Issues: For electrically driven pumps, issues such as faulty wiring, damaged solenoids, or dead batteries can prevent the pump from operating correctly, even if the hydraulic components are in good condition.

Understanding these common problems and their symptoms allows for more effective and targeted troubleshooting efforts. By addressing these issues promptly, you can maintain the operational efficiency of your Dump Trailer Hydraulic Pump and avoid costly downtime and repairs.

dump trailer hydraulic pump troubleshooting video

If you have a Dump Trailer Hydraulic Pump Troubleshooting that you can’t handle by yourself, please contact our professional engineers and we will be eager to help you answer

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dump trailer hydraulic pump troubleshooting FAQ

how to install pressure gauge in 12 volt hydraulic pump for dump trailer?

Installing a pressure gauge on a hydraulic pump is a great way to monitor the operation of your trailer. It will allow you to see how much pressure is in your system, and will also tell you if there are any leaks. In this article, we’ll show you how to install a pressure gauge on a 12 volt hydraulic pump for your dump trailer.

The first thing you need to do is remove the cap from the back of the pump. You can do this by turning it counterclockwise with your fingers or by using an adjustable wrench. Once it’s off, you should see what looks like a large bolt sticking out of the bottom of the pump. This is the check valve. It’s used to prevent fluid from escaping when no pressure is applied to it. We’ll be removing this part later on so that we can attach our new gauge.

Next, we’ll want to make sure that everything is clean before we start working on anything else in our project. To do this, you can use some rubbing alcohol or acetone (use caution when using acetone as it can damage plastic). Once everything has been cleaned off well enough for your liking, it’s time to put everything back together again!

what size hydraulic pump is use on a 14000lbs dump trailer?

The hydraulic pump is the heart of the hydraulic system, and the size of your hydraulic pump will have a direct effect on how much work can be done with it. The larger the pump, the more pressure it can create.

For example, if you have a 1/2″ line and a 1/4″ line going to the same point, you’ll get more flow out of the 1/4″ line than out of the 1/2″ line because there’s less restriction in that line – it has less restriction than the larger line.

what causes dump trailer hydraulic pump troubleshooting?

Here are some of the most common problems with dump trailer hydraulic pumps:

Faulty wiring. This is a common problem when you have a trailer that’s equipped with an electric hydraulic pump. If there is a short circuit or ground fault in the wiring, then it can cause your hydraulic pump to fail.

Loose connections. Another common problem is loose connections on the wires running from your dump trailer hydraulic pump to your controller box. This can be due to corrosion, worn out terminals, or just improper installation of new parts.

Bad controller box. If you have a controller box failure, then it could be causing your dump trailer hydraulic pump not to work properly. You may need someone who specializes in dump trailer repair to check out your controller box if this happens to you.

how to test hydraulic dump trailer pump?

1.Check the air pressure of the hydraulic pump.

2.If the air pressure is too low, check whether the air filter of the hydraulic pump is blocked. If it is blocked, clean or replace it as necessary.

3.Check whether any part of the hydraulic system is leaking or broken. If so, repair or replace it as necessary.

4.Check whether there is any damage to the seal surface and replace it if necessary.

how to purge dump trailer hydraulic pump?

A hydraulic pump is a device that converts the energy of a fluid into mechanical energy by means of the pressure, velocity or flow rate of the fluid. In this article, we will focus on how to purge a dump trailer hydraulic pump.

1.Find the drain plug at the bottom of your dump trailer hydraulic system. If you don’t see one, look in your service manual for instructions on how to find it.

2.Put your finger over the drain plug and turn it counterclockwise until it pops out. You might need pliers to remove it completely because some plugs are stuck on tight due to rust or corrosion.

3.Remove all oil from inside of your dump trailer’s hydraulic system using either compressed air or an oil-free solvent like kerosene or mineral spirits (not gasoline). Spray down all parts with compressed air or hand wipe them off until they’re clean of any oil residue and dry before continuing with steps 4 through 8 below.

pj dump trailer hydraulic pump troubleshooting ?

Hydraulic Power Units.(manufactured by KTI)
When your customer has a problem with a KTI Power Unit, we need the Model,Serial Number, Date and the last 7 digits of the Trailer VIN number.

Reservoir overflowing
Low Battery, loose Hydraulic Lines or Loose Inlet: The most common cause is low battery charge or poor ground condition.

Solenoid
The Start Solenoid is not covered under warranty since its condition is directly related to the battery charge level. Using an under-charged battery causes a high amp draw that will make the contacts stick and burned up the start solenoid.

Bed not going up or down
Causes include a failed solenoid, poor electrical connections between the control and the pump, or loose wiring in the remote itself. If the pump is running but doesn’t affect the hydraulics, it may be a stuck valve. If when the pump works in one direction but not the other, try swapping the coils, to see if it will work in the opposite direction. If this is the case, you will have a faulty coil.

dump trailer hydraulic pump wiring diagram

The dump trailer hydraulic pump is connected to the trailer hitch and is controlled by a dash mounted switch. The switch activates the relay, which in turn energizes the pump motor. When you press the brake pedal, it activates the relay and powers the circuit to open the dump valve. The cable from the brake pedal runs through a mechanical linkage that opens the dump valve when you press on it.

The dump trailer hydraulic pump is powered by a 12 volt battery, which is connected in series with a fuse and relay. The battery provides power to operate all of your vehicle’s electrical systems, including lights and accessories as well as starting your vehicle’s engine through an alternator or starter motor.

dump trailer hydraulic pump parts

Single dump trailer hydraulic pump parts

DescriptionMeasurement
Main Relief Pressure3200 +/- 150 PSI
Fluid ReccomendationDexron lll ATF (SeeTL- 188)
Pump Displacement2.1 CC/Rev
Usable Reservoir Size8 Quarts
Mounting OrientationHorizontal
Maximum Relief Current240A
SAE Port ConformanceSAE J1926-1
Duty CycleIntermittent Duty, 10% Duty Cycle, Two Minute “On Time”
Motor12V DC Motor, 1.5kW
Manual OverrideOptional (Not available on all units)
Overall Height7.87″
Overall Width6.69″
Overall Length25. .66″
Single dump trailer hydraulic pump parts

Double dump trailer hydraulic pump parts list

DescriptionMeasurement
Main Relief Pressure3200 +/- 150 PSI
Retract Relief Pressure1500 +/- 100 PSI
Fluid RequirementDexron川ATF
Pump Displacement2.1 CC/Rev
Usable Reservoir Size4, 6, or 8 Quarts
Mounting OrientationHorizontal
Maximum Relief Current275 A
SAE Port ConformanceSAE J1926-1
Duty CycleIntermittent Duty, 10% Duty Cycle, Two Minute “On Time”
Motor12V DC Motor, 2.0 kW
Manual OverrideOptional (Not available on all units)
Overall Height7.87″
Overall Width6.69″
Overal Length16.61″to 26.26″
Double dump trailer hydraulic pump parts list

If you want to fix the hydraulic pump on your dump trailer all by yourself, you can use the tips in this article for help. You can save time and money by not having to call an expensive mechanic out to fix a simple problem that you have already fixed yourself.

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Click or drag files to this area to upload. You can upload up to 2 files.
Upload a picture of the hydraulic pump you need
For you to quickly find the hydraulic pump you need, please be sure to provide the brand model and picture of the hydraulic pump