dewald hydraulic pump troubleshooting(Solutions 2023)

dewald hydraulic pump troubleshooting(Solutions 2023)

If you are in the process of troubleshooting a dewald hydraulic pump, you may realize how frustrating it can be. There are many factors that need to be considered when this problem occurs. But you can easily recognize the problem when some of these signs become noticeable. Here are the most common signs of a faulty dewald hydraulic pump.

❗❗❗ Troubleshooting any Direct Current (DC) electrical system should be done with caution and by a trained technician. Anyone unfamiliar with electrical systems should not attempt the troubleshooting procedures listed in this guide.Failure to follow these guidelines could result in personal injury or even death.

Pump assembly key

Pump assembly key is very important. Only by understanding the structure can we troubleshoot better. We will explain it to you in detail through the following pictures.

All All pumps discussed in this manual
1BL 3 or 4 quart assy
2BL 3 or 4 quart with selector manifold assy. 
3Double or triple ESV assy. 
4Quad ESV assy. 
Pump assembly key

Room(s) will not extend, pump does not run

Pump assy.Probable CauseCorrective Action
AlILow or no voltage at pump assemblyVerify that the battery is fully charged and connected to the electrical system.
AlI5 amp fuse blownCheck 5 amp in-line fuse at pump assembly. Replace as necessary.
AlIBad connection of motor ground wie at pumpCheck grounding of black wire coming directly out of 12VDC motor at the pump assembly.
AlIMotor or pump has failedCheck for continuity between blue and black wires of 12VDC motor. lf no cotinuit replace motor. If contiuity is found, then replace pump/motor assembly.
1,2,4Solenoid”A”faultyWith any room extend switch pushed, small post of solenoid “A” should show 12V+.f so, then two large posts of solenoid”A” should have continuity across them. If no contiuity, replace solenoid.
1,2,4No signal to pump assemblyCheck for 12V+ at the pump assembly on the copper buss bar that ties solenoids”A” and”B” together. If power is found, jumper the two large posts on solenoid””A” to see if pump willl run. If pump Tuns then continue trouble shooting system to isolate problem.
3No signal to relay pack from wall switch(es)The blue wire from the wall switches to the relay pack should show voltage when any room extend switch is pressed. If no voltage is found, then replace wali switch(es) as necessary.
3No signal from relay pack to 12VDC motorWith any wall swich pressed, the lug on the relay pack with the blue wire attached should show 12V+. If not, then replace relay pack.
4No signal to solenoid”A” fom cube relayWith any room extend switch pressed, terminal 87a of cube relay should show 12V+. If so, then terminal 30 should show 12V+. If no voltage at 30, then replace cube relay.
dewald hydraulic pump Room(s) will not extend, pump does not run

Room(s) will not extend, pump does run

Pump assy.Probable CauseCorrective Action
AlIL _ow fluid levelFill tank to proper level. See Preventive Maintenance and Recommended Fluids, pg21.
AlIThe siliver, knurled knob on the hand pump is openKnurled knob must be turned clockwise for normal operation.
3,4Faulty coi(s)Check for continuity across the two yellow wires coming out of each of the coils. If no continity replace coil(s)、.
3,4Valve coils miswired Check wiring diagrams. 
dewald hydraulic pump Room(s) will not extend, pump does run

Room extends, but erratically

Pump assyProbable CauseCorrective Action
AlIRoom is out of synchronizationSee “cable adjustment, pg 20.
AlIRoom seals or rails dryLubricate room seals and rails with slicone spray.
AlIInternal leak in slide room cylinderSee diagnosing a Dewald cylinder for internal leakage” ,p9 19.
Room extends, but erratically

Pump does not shut off when extend switch is released

Pump assyProbable CauseCorrective Action
1,2,4Solenoid“A”faultyRemove blue wire from large top post of solenoid“A”.Test across the two large posts of solenoid“A”for continuity while the extend switch is pressed.If continuity remains after switch is released, then replace
solenoid.
1,2,4Faulty switchRemove blue wire from large top post of solenoid“A”.Check for voltage at small bottom post of solenoid“A”while the extend switch is pressed.If voltage remains after switch is released, then replace switch.
3Relay pack faultyRemove large blue wire from lug of relay pack.Test across that lug and the center lug(red wire) for continuity while the extend switch is pressed.If continuity remains after switch is released, then replace
relay pack.
3Faulty switchRemove large blue wire from lug of relay pack.Check for voltage at blue wire in relay pack coming from switches while the extend switch is pressed.If voltage remains after switch is released, then replace switch.
Pump does not shut off when extend switch is released

Wrong room extends

Pump assyProbable CauseCorrective Action
2Wrong selector knob chosenChose correct selector knob.
2Faulty selector knobRemove selector knob from manifold assembly and inspect the end for damage or contamination. Swap with a known good valve on manifold. If symptom swaps, then replace selector knob. If symptom does not swao, then continue troubleshootina to isolate defective comoonent.
2, 3,4Cylinders plumbed to manifold incorrectlyCheck plumbing of cylinders (See hydraulic diagrams, pg. 17)
3, 4Stem valves are in manual override positionTurn slotted set screws at tlhe end of the valves counterclockwise until they stop. If system has red knobs instead of set screws, turn knobs until they “snap” back into position (see oo 6).
3, 4Coils and/or switches wired incorrectlyCheck wiring of coils and switches according to the wiring diagrams contained in this manual.
3, 4Faulty stem valveSwap suspected stem valve with a known good stem valve on manifold. If symptom swaps, replace stem valve. If stem valve has red knurled knob on the end (old style), then valve and coil must be replaced.
Wrong room extends

Room “creeps” back in once extended

Pump assyProbable CauseCorrective Action
AllA leak somewhere in systemCheck all hoses, hose connections, pump assembly, etc for any visible
fluid leak. Repair any found leaks as necessary.
AllAir trapped in systemVerify that hose connection ports on cylinder are pointing as close to 12
o’clock as possible. Cycle room(s) to complete extension and retraction
allowing system to rest 5 minutes in-between cycles. Do this 4 times.
This should purge the air from the system
AllBad piston seal in cylinder(s)Test for internal cylinder seal leakage per instructions on pg 19.
AllBad o-ring seal between hand pump and pump
assembly
Install o-ring kit #800176 as per pg 22.
AllThe silver, knurled knob on the hand pump is
open
Knurled knob must be turned clockwise for normal operation.
1Bad piston seal in cylinder(s)On the BL 4 quart pump assembly where 2 or more rooms are teed
together, a bad cylinder on one room can make another room creep
back in. Be sure to check all cylinders for internal piston seal leakage on
these systems
3, 4Stem valves are in manual override positionTurn slotted set screws at the end of the valves counterclockwise until
they stop. If system has red knobs instead of set screws, turn knobs
until they “snap” back into position (see pg 6).
3, 4Faulty stem valveSwap suspected stem valve with a known good stem valve on manifold.
If symptom swaps, replace stem valve. If stem valve has red knurled
knob on the end (old style), then valve and coil must be replaced.
Room “creeps” back in once extended

Room(s) will not retract, pump does not run

Pump assy.Probable CauseCorrective Action
AllLow or no voltage at pump assemblyVerify that the battery is fully charged and connected to the electrical
system.
All5 amp fuse blownCheck 5 amp in-line fuse at pump assembly. Replace as necessary.
AllBad connection of motor ground wire at pumpCheck grounding of black wire coming directly out of 12VDC motor at
the pump assembly.
AllMotor or pump has failedCheck for continuity between blue and black wires of 12VDC motor. If
no continuity, replace motor. If continuity is found, then replace
pump/motor assembly.
1, 2, 4Solenoid “B” faultyWith any room retract switch pushed, small post of solenoid “B” should
show 12V+.If so, then two large posts of solenoid “B” should have
continuity across them. If no continuity, replace solenoid.
1, 2, 4No signal to pump assemblyCheck for 12V+ at the pump assembly on the copper buss bar that ties
solenoids “A” and “B” together. If power is found, jumper the two large
posts on solenoid “B” to see if pump will run. If pump runs then
continue trouble shooting system to isolate problem.
3No signal to relay pack from wall switch(es)The green wire from the wall switches to the relay pack should show
voltage when any room retract switch is pressed. If no voltage is found,
then replace wall switch(es) as necessary.
3No signal from relay pack to 12VDC motorWith any wall switch pressed, the lug on the relay pack with the green
wire attached should show 12V+. If not, then replace relay pack.
4No signal to solenoid “B” from cube relayWith any room retract switch pressed, terminal 87a of cube relay should
show 12V+. If so, then terminal 30 should show 12V+. If no voltage at
30, then replace cube relay.
Room(s) will not retract, pump does not run

Room(s) will not retract, pump does run

Pump assyProbable CauseCorrective Action
AllLow fluid levelFill tank to proper level. See Preventive Maintenance and Recommended Fluids, pg 21.
AllSystem overfilled with fluidDrain tank to proper level. See Preventive Maintenance and Recommended Fluids, pg 21.
3, 4Faulty coil(s)Check for continuity across the two yellow wires coming out of each of the coils. If no continuity, replace coil(s).
3, 4Valve coils miswiredCheck wiring diagrams.
Room(s) will not retract, pump does run

Room retracts, but erratically

Pump assyProbable CauseCorrective Action
AllRoom is out of synchronizationSee “cable adjustment”, pg 20.
AllRoom seals or rails dryLubricate room seals and rails with silicone spray.
AllInternal leak in slide room cylinderCheck cylinder for internal piston seal leakage. See “diagnosing a Dewald cylinder for internal leakage” , pg 19.
Room retracts, but erratically

Pump does not shut off when retract switch is released

Pump assyProbable CauseCorrective Action
1, 2, 4Solenoid “B” faultyRemove green wire from large top post of solenoid “B”. Test across the two large posts of solenoid “B” for continuity while the retract switch is pressed. If continuity remains after switch is released, then replace solenoid.
1, 2, 4Faulty switchRemove green wire from large top post of solenoid “B”. Check for voltage at small bottom post of solenoid “B” while the retract switch is pressed. If voltage remains after switch is released, then replace switch.
3Relay pack faultyRemove large green wire from lug of relay pack. Test across that lug and the center lug (red wire) for continuity while the retract switch is pressed. If continuity remains after switch is released, then replace relay pack.
3Faulty switchRemove large green wire from lug of relay pack. Check for voltage at green wire in relay pack coming from switches while the retract switch is pressed. If voltage remains after switch is released, then replace switch.
Pump does not shut off when retract switch is released

Wrong room retracts

Pump assyProbable CauseCorrective Action
2Wrong selector knob chosenChose correct selector knob
2Faulty selector knobRemove selector knob from manifold assembly and inspect the end for damage or contamination. Swap with a known good valve on manifold. If symptom swaps, then replace selector knob. If symptom does not swap, then continue troubleshooting to isolate defective component
2, 3, 4Cylinders plumbed to manifold incorrectlyCheck plumbing of cylinders (See hydraulic diagrams, pg. 17)
3, 4Stem valves are in manual override positionTurn slotted set screws at the end of the valves counterclockwise until they stop. If system has red knobs instead of set screws, turn knobs until they “snap” back into position (see pg 6).
3, 4Coils and/or switches wired incorrectlyCheck wiring of coils and switches according to the wiring diagrams contained in this manual.
3, 4Faulty stem valveSwap suspected stem valve with a known good stem valve on manifold. If symptom swaps, replace stem valve. If stem valve has red knurled knob on the end (old style), then valve and coil must be replaced.
Wrong room retracts

Room “creeps” back out once retracted

Pump assyProbable CauseCorrective Action
AllA leak somewhere in systemCheck all hoses, hose connections, pump assembly, etc for any visible fluid leak. Repair any found leaks as necessary.
AllAir trapped in systemVerify that hose connection ports on cylinder are pointing as close to 12 o’clock as possible. Cycle room(s) to complete extension and retraction allowing system to rest 5 minutes in-between cycles. Do this 4 times. This should purge the air from the system.
AllBad piston seal in cylinder(s)Test for internal cylinder seal leakage per instructions on pg 19.
AllBad o-ring seal between hand pump and pump assemblyInstall o-ring kit #800176 as per pg 22.
AllThe silver, knurled knob on the hand pump is openKnurled knob must be turned clockwise for normal operation.
1Bad piston seal in cylinder(s)On the BL 4 quart pump assembly where 2 or more rooms are teed together, a bad cylinder on one room can make another room creep back out. Be sure to check all cylinders for internal piston seal leakage on these systems.
3, 4Stem valves are in manual override positionTurn slotted set screws at the end of the valves counterclockwise until they stop. If system has red knobs instead of set screws, turn knobs until they “snap” back into position (see pg 6).
3, 4Faulty stem valveSwap suspected stem valve with a known good stem valve on manifold. If symptom swaps, replace stem valve. If stem valve has red knurled knob on the end (old style), then valve and coil must be replaced.
Room “creeps” back out once retracted
kefu

If you need to replace the dewald hydraulic pump, please contact our engineers, we will provide you with a cost-effective dewald hydraulic pump

It is convenient for our customer service staff to contact you in time
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

dewald hydraulic pump parts

If you are looking for DEWALD pump parts, you have come to the right place. We offer a wide variety of Dewald hydraulic pump parts including: motor housings, motors, check valves, shafts, seals and more. As your single source supplier for Dewald pumps, we can provide you with the highest quality components available anywhere on the market today. Our engineers work closely with our customers to design custom solutions for tough applications such as mining operations or other heavy duty industries. We also carry a large inventory of off-the-shelf DEWALD replacement parts in stock for fast delivery worldwide.

dewald hydraulic pump parts
dewald hydraulic pump parts
  • Return all rooms and leveling legs to the travel/storage position.
  • Disconnect the battery for the coach and pump system.
  • Drain the tank of oil with a siphon.
  • Mark each hose, and wire for their respective positions.
  • Remove each hose from the pump assy. and insert the ends into a bucket in case of leakage.
  • Remove the power leads to the pump motor (green, blue, and black).
  • Remove the pump from its mounting bracket. Take it to a clean, well-lighted workbench for disassembly.
  • Remove the tank; drain any remaining fluid and clean inside of tank with a lint free cloth.
  • Remove the hand pump from the assembly by removing the two nuts and lock-washers. Removal may be difficult with the inlet strainers in place. While pulling the hand pump off of the hollow tubes, pivot the hand pump down to clear the strainers after it clears the tubes.
  • Insert a long Allen wrench small enough to fit through the holes in the hollow tubes to check them to make sure they are tight (right hand thread).
  • Clean the components before re-assembly.
  • Install 2 new o-rings (VA25400) onto each tube (4 total), lubricate them with Dexron III.
  • Re-install the hand pump onto the pump assy.
  • Install one white o-ring (VA20000) onto each of the two tubes. Push the assembly together as much as possible to align the housing and tubes so the o-rings will be seated correctly.
  • Re-install the nuts onto the tubes and tighten to 70 inch/ pounds.
  • Install new o-rings (VA14350 and VA25300, 1 each) onto hand pump assembly and re-install the tank.
  • Re-install the pump components in reverse order of disassembly making sure to match the hose and wire markings.
  • Re-fill the tank with Dexron III fluid until ½” from the top of the tank.
  • Run the rooms and or leveling legs to full extension, wait 30 seconds and retract the rooms and leveling legs. Repeat this 4 times. This should completely purge air from the system.
  • Check the fluid level in the tank with all rooms and jacks retracted. Fill to proper level if necessary.
  • Test the system for proper operation, leaks, etc.
Part #DescriptionColorABCDE
130-11551.5×24 extBlack25.251.7518.37.7575
130-11561.5x 24 non extBlack25.251.756.75.75.75
130-11571.5×41 extBlack42.251.7518.37.7575
130-12261.5X 42 non extBlack45.251.757.0.75.75
130-1159 i i1.5x 38 extBlack42.251.7518.37.7575
CW103202x 24 non extGreen25.02.387.0.75.75
CW10323S2x 32 non extYellow32.752.387.0.7575
cw1 0324S2x 32 non extYellow33.02.387.0.7575
+CW10325S2×38 non extGray_39.02.387.0.75.75
CW1 0326S2x 38 extGray39.02.3818.37.7575
*CW103272×40 non extGreen41.02.387.0.75.75
CW103292×48 non extYellow49.02.387.0.7575
*CW104002 x40 (Dutchmen)Black36.752.387.75.75
CW104161.125x 16.5 non extBlack17.381.382.75.625.625
+CW104201.5x 20 non ext23.51.8753.5.75.75
+CW105002×44 non extBlue45.02.387.0.75.75
+CW105201 5x 20 nonextGray23.12t 1.757.25.75.75
CW10524S1.5 x 24 non extGray27.51.757.0.625.75
+CW105341.5x 34 non extBlack_37.121.757.25.75.75
+CW105381.5x 38 non ext39.251.387.0.75.75
+CW106201.5x 20 non ext23.51.887.25.625.625
CW106381.5x 38 non extPurple39.251.756.75.75.75
CW106401.5×40 non extGreen41. 251.757.0.75.75
CW107191.5x 19 extBlue20.251.7518.62.75.75
CW107201.5×20 non extGray_20.881.757.12.75.75
+CW107241.5 x24 non extGreen25.251.757.0.7575
CW107261.5x 26 extRed27.251.7518.62.75.75
CW107291.5x 29 non extRed30.251.754.0.75.75
CW107321.5×32 extYellow33.251.7518.62.75.75
+CW107381.5x 38extGray39.251.7518.62.75.75
+CW107411.5×41 extBlue42.251.7518.62.75.75
+CW108201.5x 20 non extPurple20.881.753.5.75.75
+CW108241.5×24 extGreen25.251.7518.62.7575
DN118161.5x 40(Dutchmen)_Black40.51.753.18.75
*DN11997S1.5×38Black41.51.757.0.625.625
+CW101202×3233.02.387.01.12n/a
*CW101402×17Black18.02.387.01.12n/a
CW10175S2×24Red25.02.387.01.12n/a
+CW102002×32Yellow33.02.387.01.12n/a
CW10300S2×3839.02.387.01.12n/a
CW104102x 44Gray45.02.387.01.12n/a
dewald hydraulic pump parts

dewald hydraulic pump troubleshooting video

dewald hydraulic pump troubleshooting FAQ

If you’re looking for information about dewald hydraulic pump troubleshooting FAQs, you’ve found the right place. Here you’ll find loads of practical tips and hints to get you started with a new business or to help you grow your existing one.

what type of hydraulic fluid for dewald slide out pump?

Synthetic Hydraulic Fluids

These fluids are made from chemicals such as ester or phenol and have been used in place of petroleum based oils for a number of years now. These fluids have a number of advantages over the conventional mineral oil based fluids including:

Higher temperature range – They are able to operate at higher temperatures than their petroleum counterparts, making them ideal for use with high temperature machinery such as the DeWalt slide out pump;

Better lubricity – Synthetic fluids possess higher lubricity than their traditional mineral oil counterparts, meaning they are less likely to cause wear on moving parts;

Reduced fluid degradation – Synthetic fluids do not degrade at the same rate as mineral oils do when exposed to sunlight or UV light (due to their chemical makeup);

dewald hydraulic pump manual can be found there?

We provide you with a very professional manual, click the link below to download it for free!
Dewald hydraulic pump manual

dewald hydraulic pump Slide out not working?

The Dewalt slide-out works fine when it’s at full extension. But if you try to retract it, it just stops and won’t go back in. I’ve checked all of the hoses and they all seem to be connected. The only thing that is different than when I first bought it is the fluid level hasn’t gone down since I filled it up about a year ago. There was no leakage or anything like that involved with filling the fluid, so I don’t think there’s a leak in the system.

The pump is probably overfilled with oil and not draining properly. Try removing some oil from the reservoir using a turkey baster or similar device until you’re sure that there’s enough room for air to enter before starting up again (you can always put more back in later if needed).

Dewald hydraulic pump failed?

In the photo below, the red arrow points to the failed Dewald hydraulic pump. This failure occurred after only 3 years of operation. The pump runs on a shaft that is connected to the engine crankshaft by means of a crank pulley. When this pump fails, it usually means that the crankshaft is bent and must be replaced as well as the hydraulic pump.

The part number for this particular Dewald hydraulic pump is HC-2S-A-112-0210. The model number is HC-2S-A-112-0210 and it has 2 cylinders with a stroke length of 1″ (25mm). Each cylinder has an operating pressure rating of 3000 psi (207 bar). The maximum flow rate for each cylinder is 6 GPM (26 L/min).

Hi all! I hope you found this post to be helpful. If you have any questions, or would like advice on a different hydraulic pump please feel free to contact us and we can connect you with the technician who specializes in that pump type. Thanks!

Hydraulic Pump

About Me

Our products are designed to meet the high-performance and reliability requirements of industrial machinery, as well as the needs of end users. We have a broad range that covers all aspects of hydraulic technology, including liquid-cooled pumps, dry-running pumps, high-pressure pumps and special-purpose pumps.

Share:

Table of Contents

Related Posts

Linde-Hydraulic-Pump-Repair-Manual

Linde Hydraulic Pump Repair Manual

A Linde Hydraulic Pump Repair Manual is a comprehensive guide designed to assist technicians, mechanics, and engineers in the proper procedures for repairing Linde hydraulic

Shopping Cart
Get a quick quote
It is convenient for our customer service staff to contact you in time
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