Approved Hydraulic Steering Fluids; Important Information About Through-The-Transom Exhaust; Introduction; Installing The Steering Cylinder - Mercury MerCruiser Service Manual

Compact Hydraulic Steering
Lubricants, Sealants, Adhesives
Tube Ref No.
Loctite 567 PST Pipe
9
Sealant
2-4-C with PTFE
95
Synthetic Power Steering
138
Fluid SAE 0W-30

Approved Hydraulic Steering Fluids

Description
Hydraulic Helm Steering Fluid
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.
Loctite 567 PST Pipe
9
Sealant
2. Install the pivot bolt bushings into the steering cylinder pivot bolt holes.
a
b
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.
2-4-C with PTFE
95
Page 8B-2
Description
Description
c
42819
Description
© 2016 Mercury Marine
Where Used
90° fittings
Pivot bolt bushings and pivot bolt threads
Clevis pin and clevis
Hydraulic hose end O-ring area
Power steering reservoir
Where used
Hydraulic hose end O‑ring area
Where Used
90° fittings
a - Starboard elbow fitting
b - Port elbow fitting
c - Cylinder pivot bolt bushings
Where Used
Pivot bolt bushings and pivot bolt threads
92-802859A 1
92-858077K01
Part Number
92‑862014Q1
92-802859A 1
90-8M0099748 eng DECEMBER 2015
Part No.
92-809822
Part No.
92-809822
Part No.