Denison Hydraulics P11S Series User Manual

40 pages

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DENISON HYDRAULICS

axial piston variable displacement with auxiliary

package external replenishing pump Goldcup

series P11S & P14S C mod

service information

Publ. S1-AM023-C Revised 6/04

www.comoso.com

Questions and Answers:

J
John SandersAug 22, 2025
What to do if there are pressure shocks in my Denison Hydraulics P11S?
- T
  Tyler SolomonAug 22, 2025
  Pressure shocks in your Denison Hydraulics Water Pump can arise from several factors. These include a cogging load, which requires mechanical considerations, a worn relief valve or compensator, both needing repairs. Other causes are slow response in check valves (replace or relocate), servo pressure being too low to maintain firm control (increase pressure and check pressure drop through servo filter), excessive de-compression energy rates (improve decompression control), excessive line capacitance (reduce line size or lengths eliminate hose), or barrel blow-off (re-check pump hold-down, rotating group, drain pressure).
J
Jennifer HarrisSep 1, 2025
Why is there high wear in my Denison Hydraulics P11S Water Pump and motor?
- K
  Kevin BowmanSep 1, 2025
  High wear in your Denison Hydraulics Water Pump and motor can be caused by several factors: excessive loads (reduce pressure settings, reduce speeds), contaminant particles in the fluid (caused by improper filter maintenance, filters that are too coarse, introduction of dirt to the system, improper reservoir openings or breather, or improper line replacement), improper fluid (fluid too thin or thick for operating temperature, breakdown of fluid with time/temperature/shearing effects, incorrect additives in new fluid, or destruction of additive effectiveness with chemical aging), or unwanted water in the fluid (condensation, faulty breather/strainer, heat exchanger leakage, faulty clean-up practice, or water in makeup fluid).