Pump Pressure Test - Mercury MerCruiser Service Manual

Power-Assisted Steering Pump and Related Components
NOTE: For complete flush test device installation instructions, refer to Sterndrive Water Pickups in Section 1C .
7. Start the engine and operate it at 1000–1500 RPM until it reaches normal operating temperature.
8. With the engine at idle speed, the test gauge reading should be 483–862 kPa (70–125 psi). If not, proceed as follows:
•
If it is lower than 483 kPa (70 psi), refer to Pump Pressure Test.
• If it is higher than 862 kPa (125 psi), check for hose restrictions in the power‑assisted steering system.
Excessive operation can cause product damage. Do not lug the pump at maximum pressure for more than 5 seconds.
9. Push in, then pull out on the steering cable. The gauge should show an instant increase in pressure when the block is
pushed in both directions.
10. Push the steering cable in until the booster cylinder piston rod is fully retracted. With the piston rod in this position, push
the steering cable in until a maximum pressure reading is obtained.
• If the pressure is above 6897 kPa (1000 psi), the system pressure is good.
• If the pressure is below 6897 kPa (1000 psi), conduct the Pump Pressure Test.

Pump Pressure Test

Excessive operation can cause product damage. Do not lug the pump at maximum pressure for more than 5 seconds.
1. Remove the high‑pressure hose at the control valve, and install the test gauge between the hose and the control valve.
c
b
a
Power Steering Test Gauge Kit
Page 8A-24
Standard Bravo shown
NOTICE
NOTICE
a - Control valve
b - High‑pressure hose
c - Test gauge
d - Gauge‑to‑control‑valve hose
d
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© 2016 Mercury Marine
26735
91‑38053A05
90-8M0099748 eng DECEMBER 2015