Hydraulic Repair Hydrostatic Pump Hydrostatic Equipment Hydrostatic Transmission
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Hydrostatic Transmission Service LLC
We service Aurora hydrostatic pumps.
Exellent Aurora pump repair
Hydrostatic Transmission Service,LLC Offers Denison Hydrostatic Parts and Denison Hydrostatic Repair
High wear in pump
Unwanted water in fluid
Water vapor Faulty breather, strainer Heat exchanger leakage ' wrongful clean-up practice Water in makeup fluid
Cogging load Worn release valve
Mechanical considerations Needed repairs
Worn compensator Slow response in check valves
Make repairs Replace or relocate
Servo pressure too low to sustain firm control
Increase pressure and check pressure drop through servo filter
Too much decompression energy rates
Improve decompression control
Excessive line capacitance (line volume, line stretch, accumulator effects)
Lower line size or lengths. Get rid of hose Bleed air
Double check pump hold-down, rotary motion group, drain pressure
Heating of fluid
Excessive pump leakage
Look over again the case drain flow and repair as required Fluid too thin Improper assembly, port timing
Set too low (compared to load or to compensator) Not stable enough that is caused by back pressure, worn parts
Set too high (compared to release) Worn parts
Pump too large for fluid needs
Choose smaller pump displacement
Water turned off or too little flow Water too hot Fan clogged or restricted Efficiency lowered by mud or scale deposits On and off hydraulic fluid flow
Too little fluid Entrained air in fluid Improper baffles Keeping in air blanket that prevents heat rejection Heat pickup from adjacent equipment
Revised Limits of Wear Parts
Port plate face
Cylinder barrel face
Shoe retainer face
Piston shoe face (pocket)
Creep plate face
Part problems and circuit problems are frequently inter-related. A faulty circuit may work with obvious success but will cause failure of a particular part within it. The part failure is effect, not the reason of the problem. This broad guide is on hand to help in locating and eliminating the cause of problems by studying their effects.
Some of the Remedies for Problems
Air in Fluid
Leak in suction line Leak at shaft seal Low fluid level Turbulent fluid Return lines above fluid level Gas leak from accumulator Too much pressure drop in the inlet line from a pressurized reservoir Suction line strainer trying to be an air trap as well
Cavitations in pump or motor rotating group
Fluid too cold and viscous Fluid too heavy Shaft speed too high Suction line too small Suction line collapsed Suction strainer too small Suction strainer not clean Working altitude too high Boost or replenishment pressure too low Replenishment flow too small for dynamic conditions
Faulty installation Improper in mounting Axial interference Faulty coupling Extreme overhung loads
Mechanical fault in pump
Piston and shoe looseness or failure Bearing failure Incorrect port plate selection or index Eroded or worn parts in the displacement control
Erosion on barrel ports and port plate
Air in fluid
Lower pressure settings Reduce speeds
Contaminant particles in fluid
Faulty filter maintenance Filters too coarse Putting in dirty fluid to system Reservoir openings Reservoir breather Improper line replacement
Fluid too thin or thick for working temperature range Breakdown of fluid with time/temperature/shearing effects wrong additives in new fluid Breakdown of additive effectiveness with chemical aging
Incorrect parts,procedures, dimensions, finishes
Barrel and Stroking Assembly to Mounting Flange
See Fig 3
Barrel & auxiliary shaft ass y
Override pressure lubes
Tubing ass y (right sidei
Tubing ass y (left sidei
See Fig. 2
Rocker cam & stroking ass y
Face plate pins
Barrel face plate P1 1 P only
Barrel (ace plate P1 4P only
See Fig. 5
Hydrostatic Parts and Denison Hydrostatic Repair
Hydrostatic Transmission Service,LLC Offers Denison Hydrostatic Parts
and Denison Hydrostatic Repair
Guidelines for Replenishing Circuit Isolation Plug
When the outer filter circuit is not used, dispose of the isolation plug.
When the outside filter circuit is used, fit the isolation plug under the plug in the face of the port block. Use a 3/16" hex wrench, 4" minimum in length. Insert the isolation plug and tighten to 80-120 in./lbs. torque.
Filter should have a bypass and bypass indicator and Hydrostatic Transmission Service,LLC which offers Denison recommends that it be sized four times for projected flow.
Barrel and Auxiliary Shaft Assembly
1. Fit in the barrel (1) with the bores facing down on a clean area.
Fix the barrel stop (4) over auxiliary driveshaft (2). Rotate barrel on side and put the auxiliary drive shaft and barrel stop into the barrelspline and hold down spring.
Barrel & sleeve assy Pi 1 P only
Barrel & sleeve assy PHP only
Auxiliary drive shaft
24 Hour Service
Fast Turn Around
For a list of our Eaton pumps and prices, go to our Eaton hydrostatic parts page
Or visit us at our EBay store: Hydrostatic Transmission Service, LL
HYDRAULIC REPAIR – HYDROSTATIC PUMPS – HYDROSTATIC EQUIPMENT
CALL US FOR YOUR REPAIR ON DIFFICULT TO LOCATE DENISON HYDROSTATIC TRANSMISSION REPAIR.
DENISON .MITSUBISHI, KAWASAKI, DAEWOO ,DYNAPOWER, LINDE, REXROTH, UCHIDA, YAMAHA, HITACHI, KOMATSU, LIEBHERR, POCLAIN, VOLVO, VICKERS, CESSNA, HYDROMATIK AND SUNDSTRAND AND EATON CLOSED LOOP AND OPEN LOOP HYDROSTATIC DRIVE PUMPS AND MOTORS.
404 Air Park Rd Tupelo, MS 38801Phone: (662) 680-8899Toll Free: (800) 361-0068
Disclaimer: All references to OEM words are strictly for reference only and does not imply that we are an OEM distributor.
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