Mercury MERCRUISER, Service Manual, Page: 528 / 566

Lubricants, Sealants, Adhesives
Tube Ref No. Description Where Used Part No.
9
Loctite 567 PST Pipe
Sealant
90° fittings 92-809822
95
2-4-C with PTFE
Pivot bolt bushings and pivot bolt threads
Clevis pin and clevis
92-802859A 1
138
Synthetic Power Steering
Fluid SAE 0W-30
Hydraulic hose end O-ring area
Power steering reservoir
92-858077K01
Approved Hydraulic Steering Fluids
Description Where used Part Number
Hydraulic Helm Steering Fluid Hydraulic hose end O‑ring area 92‑862014Q1
Important Information About Through‑the‑Transom Exhaust
IMPORTANT: This compact hydraulic steering system is not designed for use with through‑the‑transom exhaust systems.
Introduction
The system has a pressure‑relief valve to protect against internal fluid pressure becoming too high for the individual system
components. This valve minimizes the possibility of a total loss of steering.
The steering cylinder is an unbalanced cylinder: in any position the port and starboard cylinder chambers will have different
volumes. This is important when setting the hydraulic fluid level, as outlined later.
The steering unit may not function properly if dirt or contaminants are introduced into the system.
IMPORTANT: Due to a small amount of internal hydraulic fluid transfer (slip), a master spoke or centered steering wheel cannot
be maintained with a hydraulic steering system. For best results, use an equal‑distance spoke steering wheel.
IMPORTANT: This section will not guide you through installation of the hydraulic power‑assisted steering kits, refer to the
installation instructions provided with these kits.
Installing the Steering Cylinder
1. Apply Loctite 567 PST Pipe Sealant to the threads (pipe threads only) of the two 90° elbow fittings and install them into the
steering cylinder. Orient the fittings according to the application and the routing of the hydraulic hoses to the steering
cylinder. Tighten the 90° fittings securely.
IMPORTANT: Apply thread sealant to three threads all the way around the elbow fitting, leaving the first thread free of
sealant. Tighten the fitting 1‑3/4–2‑1/2 turns after hand‑tight.
Tube Ref No. Description Where Used Part No.
9
Loctite 567 PST Pipe
Sealant
90° fittings 92-809822
2. Install the pivot bolt bushings into the steering cylinder pivot bolt holes.
a - Starboard elbow fitting
b - Port elbow fitting
c - Cylinder pivot bolt bushings
3. Install the steering cylinder assembly as follows:
a. Ensure that the pivot bolt bushings on the new steering cylinder are clean.
b. Lubricate the pivot bolt bushings and pivot bolt threads.
Tube Ref No. Description Where Used Part No.
95
2-4-C with PTFE Pivot bolt bushings and pivot bolt threads 92-802859A 1
a
b
c
42819
Compact Hydraulic Steering
Page 8B-2 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015