The purpose of this eaton hydraulic pump Repair manual is to fully inform the reader about how the repair their damaged or malfunctioning Eaton Hydraulic pumps provided their system has been properly checked for internal damage and a good amount of fluid has been allowed for warm up. This repair guide covers all aspects of an Eaton Service Repair, including what to look out for when trying to find your model number, dis-assembly, cleaning and reassembly processes.
Eaton 420 Mobile Piston Hydraulic Pump Repair Manual
Remove Control Piston Plug Assembly (Disassembly)
Remove two nuts that hold down a bracket that supports a small air filter assembly directly below it on top of the transmission cooler lines just behind where they enter into an opening in front of your left rear tire (driver’s side).
Install Swash Plate Locator Tool
(Note: Adjustment will take place in Step 11)
Remove Compensator
Eaton 420 piston pump compensators are used on Eaton 420 hydraulic pumps to prevent over pump pressure. The compensator can be removed by removing the retaining ring, retainer, and spring. The piston assembly can then be pulled out of the body of the compensator.
Remove End Cover
Note: The valve plate may stick to end cover. Use caution so valve plate does not fall off. Mark the housing and end cover to ensure orientation. Remove the four cap screws that hold
the end cover in place.
Remove Valve Plate
The Eaton 420 Piston Hydraulic Pump Valve Plate is a part that is used in various different applications of the Eaton 420 Series. The valve plate is made for gas turbine pumps. It can be used with pumps which have a single or multiple piston assemblies, depending on your application. This valve plate has been placed inside an oil circuit in the Eaton 420 Series, and it has been well established to last the test of time.
Remove O-ring Seal
I hope you enjoy my blog post on how to remove Eaton 420 piston hydraulic pump o-ring seal. I compiled this blog post after several months of researching, reading and listening to instructions on how to remove the o-ring seal.
Remove Bearing Race
Note: The bearing race is pressed in and will require the use of a sliding bearing removal hammer or similar tool to remove it.
Remove Housing O-rings
Have you ever wondered how to remove an Eaton 420 piston hydraulic pump housing? Even if you’ve never worked on a car before, with the proper tools and knowledge, it is a fairly easy do-it-yourself project.
Remove Bearing
Removing the bearing from the Eaton 420 hydraulic piston pump isn’t difficult, but there is a trick. The trick is to know that you shouldn’t remove the connector piece, it should be removed with the shaft (as one piece connecting to the shaft). You’ll see how easy this is below and how it really isn’t all that difficult.
Install Swashplate Retainer
Note: Install the swash plate hold down tool and tighten the cap screw 16147-804. This will prevent the swash plate from moving.
Swashplate Locator Adjustment
Note: This step is designed to force the swashplate to a neutral position to enable easy removal of the rotating group, and to retain the swashplate. With the hold down tool in place, tighten the adjustment screw so the control piston spring is compressed.
Install Shaft Retainer Tool
Note: Tighten the set screw while being careful not to damage shaft.
Remove Rotating Group
Note: Position shaft upwards and carefully remove rotating group
Remove Shaft
Note: Remove shaft retainer tool and lift out shaft.Use caution when moving shaft through shaft seal.
Remove Swashplate Locator
Here is a list of steps to install an Eaton 420 Piston Hydraulic Pump Swashplate Locator. The guide is suitable for anyone who wants to get some helpful information or anyone who doesn’t feel like hiring a handyman and would like to do it themselves.
Remove Swashplate Retainer
Removing the Eaton 420 piston pump swashplate can be tricky, especially when it needs to be removed in the field. This article will guide you through five steps that allows for quick removal.
Remove Control Piston
Note: The open end of the control piston is positioned up.The control piston is allowed to rotate
Remove Swashplate
Removing an Eaton 420 piston hydraulic pump swashplate can be a struggle, but it doesn’t have to be that way. This article shows you step-by-step how to safely remove the swashplate assembly, and offers some general guidelines when working with hydraulic pumps.
Remove Bias Spring
The Eaton 420 piston hydraulic pump bias spring is used to bias the pistons in the Eaton 420 piston hydraulic pump. The Eaton 420 piston hydraulic pump bias spring helps tighten the pistons and make for even movement of oil throughout the entire system.
Remove Bearing
If you are attempting to remove the piston pump from an Eaton 420 and it won’t budge, don’t worry. You can still continue using your 420 and the piston pump will still be usable.
Remove Cradle Bearing Screws
Caution: Socket head cap screws are easily damaged during repair with improper tool.
Remove Cradle Bearings
Note: The cradle bearings are asymmetrical. The proper orientation is shown.
Remove Front Bearing Race
The rear cover of your Eaton 420 hydraulic piston pump is missing, so the size of your bearing race is different than the original one. Your bearings do not have to change. The whole solution is just taking off the old bearing race.
Remove Crush Ring
Note: The crush ring located under the bearing cup in the housing does not need to be removed. The only time the crush ring needs to be removed is when the front or rear shaft tapered roller bearings, bear-ing cups, drive shaft, end cover or housing assembly is replaced. A shim kit is required if the crush ring is replaced.
Remove Shaft Seal
Note: With the seal retaining ring removed use a punch or similar tool to knock out the shaft seal.
Install Snap Ring and Shaft Seal(Assembly)
Install Snap Ring and Shaft Seal
Install Crush Ring
Install Crush Ring
Insert the Shaft Bearing Race
Insert the Shaft Bearing Race
Install Cradle Bearings
Note: The cradle bearings are asymmetrical.Install as shown in picture.
Install Cradle Bearing Screws
Note: The old cap screws cannot be reused and must be replaced with new ones because the screws will be damaged during disassembly. The new cap screw threads will be coated with loctite. Kit #9900194-002 (2) bearings and (2) screws per kit.
Install Bearing
Install Bearing
Install Bias Spring
Install Bias Spring
Install Swashplate
Note: With the bias spring in place, tilt the swash plate toward the spring and install the swash plate.
Install Control Piston
Install Control Piston
Install Swashplate Retainer
Install Swashplate Retainer
Install Swashplate Locator
Note: Adjust the screw until the swashplate is near neutral (will look flat in housing).
Install Shaft
Caution: Use care while inserting shaft end through shaft seal.
Install Shaft Retainer Tool
Install Shaft Retainer Tool
Install the Rotating Group
Note: Position shaft upwards and carefully install rotating group.
Remove Swashplate Locator
Remove Swashplate Locator
Remove Swashplate Retainer
Remove Swashplate Retainer
Install O-ring Seal
Install O-ring Seal
Install Housing O-rings
Install Housing O-rings
Install Bearing Race
Note: Using a press, install the bearing race.
Install Valve Plate
Note: Lightly coat the back plate side of the valve plate with petroleum jelly for retention during assembly.Install the valve plate over the bearing race aligning the small slot on the outside of the valve plate with the dowel pin in the back plate.
Install Bearing
Install Bearing
Install End Cover
Install End Cover
Install Control Piston Plug Assembly
Install Compensator
Testing
Perform functional test on pump according to Eaton test procedure. Contact your area sales manager for more information.
Supply:
- Read this assembly manual thoroughly before starting work on the pump.
- This manual assumes appropriately trained technicians with specialized knowledge of mechanical and hydraulic component assembly and disassembly.
Tools:
- -Ball Peen Hammer
- -Plastic Tip Hammer
- -Flat Tip Screw Driver
- -Snap Ring Pliers
- -Torque Wrench
- -Magnet Stick
- -1-1/4″Vrench
- -1-3/8″Vrench
- -4 mm Allen Wrench
- -3/32″Allen Wrench
- -Impact Screwdriver
- -Sliding Bearing Remover Hammer
- -Dial Indicator and Accessories
- -Marker or Paint Pen
- -Petroleum Jelly
- -Cleaning Solvent
Materials: Before attempting to disas- semble, clean the pump exte- rior. Dispose of leakage oil and oily cloths in an environmen- tally responsible manner. All parts within the unit must be kept clean during the overhaul process. Handle each part with great care, marking as neces- sary to ensure proper reas- sembly. The close tolerance of the parts makes this require- ment very important. Clean all parts that are removed from the unit with a commercial solvent that is compatible with the system fluid. Compressed air may be used in the clean-ing process. However, it must be filtered to remove water and other contamination.
If You Have Any Questions About The Maintenance Of Eaton Hydraulic Pumps, You Can Always Ask Our Professional Technicians
Inspection, Repair and Part Replacement
Rotating Group Parts
1.Inspect cylinder block face for wear, scratches, and/or ero- sion. If cylinder block condition is questionable, replace the entire rotating group.
2.Remove the pistons, shoe retainer, and pivot from piston block. The piston block assembly doesn’t need to be disas- sembled unless the internal pins or spring are damaged.
3.Check each cylinder block bore for excessive wear. Use the piston and shoe S/A (37) for this purpose. The pis- tons should be a very close fit and slide in and out of the cylinder block bores. NO BINDING CAN BE TOLERATED. If binding occurs, clean the cylinder block and pistons. Lubricate the cylinder block bores with clean fluid and try again. Even minor contamination of the fluid may cause a piston to freeze up in a cylinder bore.
4.Inspect each of the nine piston and shoe subassemblies (31) for a maximum end play of 0.005 inch between the piston and shoe. Also check the face dimension of each shoe. The face dimension must be within 0.001 inch.
5.Inspect shoe retainer and pivot for wear and/or scratches. If condition is questionable, replace entire rotating group.
Piston S/A Tolerances
This dimension must be maintained on all nine shoes within 0.001 inch.
Shoe face rides on swash plate. Shoe must swivel smoothly on ball. End play must not exceed 0.005 inch.
End Cover & Associated Parts
1.Inspect end cover for ero-sion, cracks, and burrs.Clean up minor burrs withan India stone. If erosion or cracks are found, replacethe valve block.
2.Inspect roller bearing and bearing race for nicks and pitting. Make sure the roller bearing turns freely within the bearing race. If the roller bearing needs replacement, both the roller bearing and the bearing race must be replaced.
3.Inspect valve plate for ero-sion, excessive wear, heavy scratches, and cracks. If any of the above conditions are found, replace the valve plate.
4.Inspect control piston and maximum displacement screw for burrs, scratches and cracks. Clean up minor scratches with 500 grit paper. Remove burrs with an India stone. The control piston should move freely in the bore.
Swashplate Parts
1.Inspect swashplate face for wear, roughness or scoring. Check the swashplate hubs and bearing surfaces for wear and cracks. Replace if defective.
2.Inspect saddle bearing sur-faces for wear, pitting, and smooth operation. Replace if necessary.
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Shaft/Housing Parts
1.Inspect drive shaft for wear,stripped splines, and burrs.Remove burrs with an Indiastone. Inspect the contact area of bearing and shaft seal). Replace the drive shaft If wear or scoring is greater than 0.005 T.I.R. (total indica-tor reading).
2.Inspect drive shaft bearing for roughness, pitting of rollers, and excessive end play. Replace, if defective. If the bearing needs to be replaced, the bearing race also requires replacement.
3.Inspect housing mounting flange for nicks and burrs. Remove minor nicks and burrs with an India stone. Also check the housing for damaged or stripped threads. If any thread is damaged, replace the hous-ing.
4.Check remaining pump parts for excessive wear, dam-aged threads, burrs, cracks and erosion. Replace any part that is in questionable condition.
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