Pressure Test - Mercury MerCruiser Service Manual

If factory cables are used, no adjustment should be needed. If other cables are used, then the manufacturer's specifications
should be followed.
IMPORTANT: If not installed correctly, the customer will not be able to shift the transmission completely, or the cable will not be
evenly loaded between forward and reverse, and the neutral position on the transmission will not match the location on the
control box.

Pressure Test

1. Remove the pressure service port plug from port A.
2. Connect a suitable pressure gauge to port A.
3. Disconnect both wires and remove the fluid temperature switch from port B.
4. Install a thermocouple in port B.
b
a
5. Operate the boat with a normal load onboard.
6. Ensure that the fluid temperature and shifting pressure are as specified.
Description
Operating temperature
Shifting pressure
7. Repair or replace the transmission if measurements are not as specified.
8. Remove the pressure gauge and thermocouple.
9. Apply Loctite 567 PST Pipe Sealant to the fluid temperature switch threads.
90-8M0099748 eng DECEMBER 2015
ZF/45C, 45IV, 63A, 65IV Transmissions
45IV
Typical ZF Marine transmission
a - Pressure service port plug—port A
b - Fluid temperature switch—port B
8660
Specification
54–79° C (130–175° F)
Position A
Position B
© 2016 Mercury Marine
59777
2150–2350 kPa (312–341 psi) at 2000
RPM
Page 9A-17