MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 92)

Important:
This procedure requires special training and familiarity with heat exchanger operation. You must unbolt
and remove the heat exchanger from the reservoir in order to inspect it. Consult MTS before you
perform an internal inspection or any maintenance on the heat exchanger.
Procedure
To inspect the heat exchanger:
1. Shut off the HPU and the cooling water supply.
2. Externally inspect the exchanger for:
• Dents, bulges, corrosion and leaks
• Damaged gaskets
• Worn, frayed, and leaking hoses
3. Drain all hydraulic fluid from the heat exchanger.
4. Drain all water from the exchanger.
5. Clean all filters and screens.
6. Begin with an external inspection of the heat exchanger. Visually inspect for:
• Corrosion
• Signs of a previous repair
• Leakage
7. A marked decrease in pressure and/or reduction in performance usually indicates cleaning is necessary.
The following are suggested methods of cleaning either side of the heat exchanger.
• Back-flush the heat exchanger with a high pressure stream of hot water to remove loose deposits
• Circulate hot wash oil or light distillate to remove sludge or similar soft deposits.
• To remove more stubborn deposits, use a commercial cleaning compound. Follow the manufacturers
instructions for using the cleaning compound.
Important:
It is recommended that you contact a representative of the manufacturer of the cleaning compound
to determine the correct cleaning compound for your type of scaling problem and its compatibility
with the metals and alloys used in the heat exchanger.
8. If the heat exchanger is excessively fouled and cannot be cleaned using the commercial cleaning methods,
then replacement of the heat exchanger is recommended.
92 Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information
Maintenance