Experiment No :08 Assignment: Trouble shooting procedures

 

 

Expt No :08   Assignment: Trouble shooting procedures

Assignment: Trouble shooting procedures in Hydraulic/ Pneumatic system

Troubleshooting Guide & Maintenance Hints

Recognizing Trouble Indications : The ability to recognize trouble indications in a specific system is usually acquired with experience. A few general trouble indications are

ü  Excessive heat means trouble

ü  Excessive noise means wear

Maintenance : Three simple maintenance procedures have the greatest effect on hydraulic system performance, efficiency and life.

1. Maintaining a clean sufficient quantity of hydraulic fluid of the proper type and viscosity. 2. Changing filters and cleaning strainers.                                                                                      3. Keeping all connections tight, but not to the point of distortion, so that air is excluded from the system.

 

Remedies:

a.       Any or all  of the following: Replace dirty filters; wash strainers in solvent compatible with system fluid; clean clogged inlet line; clean or replace reservoir breather vent; change system fluid; change to proper pump drive motor speed; overhaul or replace supercharge pump; fluid may be too cold.

b.      Any or all of the following: Tighten leaking connections; fill reservoir to proper level (with rare exception all return lines should be below fluid level in reservoir); bleed air from system; replace pump shaft seal (and shaft if worn at seal journal).

c.       Align unit and check condition of seals, bearings and coupling.

d.      Install pressure gauge and adjust to correct pressure.

e.       Overhaul or replace

Remedies:

a. Any or all of the following: Replace dirty filters; clean clogged inlet line; clean or replace reservoir breather vent; change system fluid;

change to proper pump drive motor speed; overhaul or replace supercharge pump.

b. Any or all of the following: Tighten leaking connections; fill reservoir to proper level (with rare exception all return lines should be

below fluid level in reservoir); bleed air from system; replace pump shaft seal (and shaft if worn at seal journal).

c. Align unit and check condition of seals and bearings; locate and correct mechanical binding; check for work load in excess of circuit design.

d. Install pressure gauge and adjust to correct pressure (keep at least 125 PSI difference between valve settings).

e. Overhaul or replace.

f. Change filters and also system fluid if improper viscosity; fill reservoir to proper level.

g. Clean cooler and/or cooler strainer; replace cooler control valve; repair or replace cooler

 

Remedies:

a. Any or all of the following: Replace dirty filters; clean clogged inlet line; clean or replace reservoir breather vent; fill reservoir to proper level; overhaul or replace supercharge pump.

b. Tighten leaking connections.

c. Check for damaged pump or pump drive; replace and align coupling.

d. Adjust.

e. Overhaul or replace.

f. Check position of manually operated controls; check electrical circuit on solenoid operated controls; repair or replace pilot pressure pump.

g. Reverse rotation.

h. Replace with correct unit.

 

Remedies:

a. Replace dirty filters and system fluid.

b. Tighten leaking connections (fill reservoir to proper level and bleed air from system).

 

 

 

 

 

 

Remedies:

a. Fluid may be too cold or should be changed to clean fluid of correct viscosity.

b. Locate bind and repair.

c. Adjust, repair or replace.

d. Clean and adjust or replace; check condition of system fluid and filters.

e. Overhaul or replace.

f. Repair command console or interconnecting wires.

g. Lubricate.

h. Adjust, repair or replace counterbalance valve.