Denison Problem Solving
March 10, 2016
At our Hydrostatic Pump Repair Site, we offer many types of Hydrostatic
Transmission Repair and information relating to Hydrostatic Parts
Today we will discuss;
Denison Problem Solving
|
|
|
- Some of the Remedies for Problem
|
| High wear in pump |
Unwanted water in fluid |
Water vapor Faulty breather, strainer Heat exchanger leakage ‘ wrongful clean-up practice Water in makeup fluid |
| Pressure shocks |
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 |
| Barrel blow-off |
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 |
| Relief valve |
Set too low (compared to load or to compensator) Not stable enough that is caused by back pressure, worn parts |
| Compensator |
Set too high (compared to release) Worn parts |
| Pump too large for fluid needs |
Choose smaller pump displacement |
|
 |
|
|
| Heat exchanger |
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 |
| Reservoir |
Too little fluid Entrained air in fluid Improper baffles Keeping in air blanket that prevents heat rejection Heat pickup from adjacent equipment |
|
| Hydrostatic Transmission Service,LLC Offers Denison Hydrostatic Parts and Denison Hydrostatic Repair |
|
|
|
Revised Limits of Wear Parts |
|
|
|
|
- Max. Revised From Original Dimension
|
- Min. Dimension After Revised
|
| Port plate face |
.725/.715″ |
.010″ |
.705″ |
| Cylinder barrel face |
5.880″ |
.010″ |
5.870″ |
| Shoe retainer face |
.4387.437″ |
.005″ |
.432″ |
| Piston shoe face (pocket) |
.020″ |
.010″ |
.010″ |
| Creep plate face |
.251/.250″ |
.010″ |
.240″ |
| Face plate |
|
None |
Replace |
|
|
| Hydrostatic Transmission Service,LLC Offers Denison Hydrostatic Parts and Denison Hydrostatic Repair
800-361-0068
sales@hydrostatic-transmission.com |
