Reyco Granning IFS 1660S3 User manual

Motorhome Suspensions Owner’s Manual
Document #: D710551
Revision: J
Revision Date: 05/2022
IFS 1660S3|1700S3|1800S3|2000S3
Independent Front Suspension
Reyco Granning Suspensions
1205 Industrial Park Drive
Mount Vernon, MO 65712
Phone: [phone]
Fax: [phone]
www.reycogranning.com

Page Left Blank Intentionally

TABLE OF CONTENTS
- 1 -
Introduction ............................................................................................................................ 5
Service Notes ............................................................................................................................ 5
Identication ............................................................................................................................. 6
Model Options .......................................................................................................................... 7
Vehicle Towing Information .................................................................................................... 9
Maintenance Schedule ......................................................................................................... 10
Maintenance Record ............................................................................................................. 11
Part List ................................................................................................................................ . 12
Unit Assembly - IFS1660S3 & IFS1700S3 ............................................................................. 12
Unit Assembly – IFS1800S3 & IFS2000S3 ............................................................................ 13
Unit Assembly – IFS1701S3 ................................................................................................ .. 14
Unit Assembly - IFS20S3 ....................................................................................................... 15
Cont rol Arm Components .................................................................................................... 16
Control Arm Components Subassemblies ......................................................................... 17
Steering Components (IFS1660S3/IFS1700S3) ................................................................... 18
Steering Components (IFS18 00S3/IFS2000S3) ................................................................... 19
Steering Components (IFS1701S3) ...................................................................................... 20
Steering Components (IFS20S3) .......................................................................................... 21
Air Spring and Shock Components (IFS1800S3/IFS2000S3) .............................................. 22
Air Spring and Shock Components (IFS1701S3/IFS20S3) .................................................. 23
HCV Assembly Components (All) ......................................................................................... 24
Sway Bar Assembly Components (All) ................................................................................ 25
Disc Brake Components (ProTorq Spindle Nut) ................................................................ . 26
Disc Brake Components (Integral Spindle Nut) ................................................................ . 27
King Pin Components (All) .................................................................................................... 28
Steering Knuckle Carrier Components (All) ........................................................................ 29
Lubrication ........................................................................................................................... 30
Lubricant Specications and Intervals ................................................................................ 30
General Lubrication .............................................................................................................. 30
Ball Joi nts ............................................................................................................................... 30
Ball Studs on Tie Rods .......................................................................................................... 30
Carrier Bearing and King Pin ................................................................................................ 31
Steering Gear Hydraulic Oil ................................................................................................ .. 32
Steering Gear Trunnion Bearing .......................................................................................... 32
Steering Gear Input Shaft ..................................................................................................... 32
Wh eel Bearings ..................................................................................................................... 33
Troubleshooting.................................................................................................................. 34
Inspection ............................................................................................................................. 38
General Inspection ................................................................................................................ 38

TABLE OF CONTENTS
- 2 -
Inspecting Control Arm Bushings ........................................................................................ 38
Inspecting Tie Rod Ends ....................................................................................................... 39
Inspecting the ABS Sensor and Tone Ring .......................................................................... 39
Inspecting the Shock Absorber ............................................................................................ 40
Inspecting the Air Spring and Height Control Valve .......................................................... 40
Inspecting the Steering Arm and Relay Rod Ball Joints ..................................................... 41
Inspecting Wheel Bearing Endplay ...................................................................................... 42
Inspecting the Knuckle Carrier Bearing and Seal ............................................................... 43
Inspecting the Kingpin Vertical Endplay ............................................................................. 43
Inspecting the Steering Gear Sector Lash .......................................................................... 43
Adjustment .......................................................................................................................... 44
Adjusting Wheel End Play (PRO -TORQ ®style only) ............................................................ 44
Adjusting Suspension Ride Height ...................................................................................... 46
Adjusting the Maximum Wheel Turn Angle ........................................................................ 47
Inspection Before Alignment ............................................................................................... 48
Wheels and Tires ................................................................................................................... 48
Front Suspension .................................................................................................................. 49
Rear Axle and Suspension .................................................................................................... 49
Front Wheel Alignment ......................................................................................................... 49
Equipment ............................................................................................................................. 49
General ................................................................................................................................... 49
Preparation ............................................................................................................................ 50
Adjusting the Camber Angle ................................................................................................ 51
Eccentric Camber Adjustment ............................................................................................. 51
Bar Pin Camber Adjustment ................................................................................................ 52
Adjusting the Caster Angle ................................................................................................ . 53
Eccentric Caster Adjustment ............................................................................................. 53
Adjusting the Toe -In .............................................................................................................. 56
Repairs ................................................................................................................................ .. 57
General Procedures .............................................................................................................. 57
Cleaning the Parts ................................................................................................................. 57
Ground or Polished Parts ..................................................................................................... 58
Rough Parts ........................................................................................................................... 58
Drying ..................................................................................................................................... 58
Preventing Corrosion ............................................................................................................ 58
Replacing Tie Rod Ends ........................................................................................................ 58
Re moval ................................................................................................................................ . 58
Installation ............................................................................................................................. 58
Replacing Pitman Arm or Idler Arm Ball Joint .................................................................... 59

TABLE OF CONTENTS
- 3 -
Removal ................................................................................................................................ . 59
Installation ............................................................................................................................. 59
Replacing the Idler Arm Bearings (1660S3&1700S3) ......................................................... 60
Removal ................................................................................................................................ . 60
Installation ............................................................................................................................. 60
Replacing the Upper and Lower Control Arm Bushings ................................................... 60
Upper Control Arm Removal ............................................................................................... 61
Upper Control Arm Installation ........................................................................................... 61
Lower Control Arm Removal ................................................................................................ 62
Lower Control Arm Installation ........................................................................................... 62
Replacing Wheel Bearings, Oil Seals & Hub Caps (Pro -Torq ®Style Nut) ......................... 63
Removal ................................................................................................................................ . 63
Installation ............................................................................................................................. 64
Pre Adjusted with Integral Spindle Nut Wheel Hubs ................................................ 66
Recommended Service ..................................................................................................... 66
Hub and Component Cleaning ............................................................................................ 68
Inspecting Bearing Cups, Cones & Bearing Spacer ........................................................... 68
Removing Cups in Iron Hubs .......................................................................................... 69
Installing a New Cup in Iron Hubs ................................................................................. 69
Pre Adjusted with Integral Spindle Nut Wheel Hubs – Reassembly ................................ 69
Spindle Nut and Spiral Snap Ring Reassembly ................................................................ .. 70
Installing the Pre Adjusted with Integral Spindle Nut ....................................................... 70
Wheel Hub Assembly ............................................................................................................ 70
Replacing Brake Components ............................................................................................. 71
Brake Rotors .......................................................................................................................... 71
Brake Chambers .................................................................................................................... 71
Other Brake Components .................................................................................................... 71
Replacing the ABS Sensor and Tone Ring ........................................................................... 71
Sensor Removal .................................................................................................................... 72
Sensor Insta llation ................................................................................................................ 72
Tone Ring Removal and Installation .................................................................................... 72
Replacing the Shock Absorber ............................................................................................. 72
Removal ................................................................................................................................ . 72
Installation ............................................................................................................................. 73
Replacing the Air Spring ....................................................................................................... 73
Remo val ................................................................................................................................ . 73
Installation ............................................................................................................................. 73
Replacing the Height Control Valve ..................................................................................... 73
Removal ................................................................................................................................ . 73

TABLE OF CONTENTS
- 4 -
Installation ............................................................................................................................. 74
Replacing the Sway Bar and Components ......................................................................... 74
Vertical Linkage Removal ..................................................................................................... 74
Vertical Linkage Installation ................................................................................................ . 74
Sway Bar Removal ................................................................................................................. 74
Sway Bar Installation ............................................................................................................ 74
Replacing the Steering Knuckle Carrier Bearings .............................................................. 75
Removal ................................................................................................................................ . 75
Installation ............................................................................................................................. 75
Replacing the Steering Gearbox/Slave Unit Assembly ...................................................... 76
Removal ................................................................................................................................ . 76
Installation ............................................................................................................................. 77
Steering Gear Poppet Readjustment .................................................................................. 77
Torque Tables ...................................................................................................................... 79
Revision History
REV ECR # DATE CHANGE DESCRIPTION BY CHK APV
J 225 20 5/31/22 Format Update, Add Preset Plus Hub information, Unit Model Options
Tables
STM GMC JAH

INTRODUCTION
- 5 -
Introduction
Service Notes
This Service Manual describes the correct service and repair procedures for the Reyco Granning ®
IFS1660S3 Independent Front Suspension model with 16,600 lbs, the IFS1700S3 Independent Front
Suspension Model with 17,000 lbs, the IFS1800S3 Independent Front Suspension Model with 18,000
lbs and the IFS2000S3 Independent
Front Suspension Model with 20,000 lbs Gross Axle Weight Rating
(GAWR). Overloading the suspension may result in adverse ride and handling characteristics.
You must read and understand all procedures and safety precautions presented in this manual
before conducting any service work on the suspension.
Proper tools must be used to perform the maintenance and repair procedures in this manual.
Some procedures require the use of special tools fo r safe and correct service. Failure to use the
proper and/or special tools when required can cause personal injury and/or damage to suspension
components.
You must follow your company safety procedures and use proper safety equipment when you
service or repair the suspension.
The information contained in this manual was current at the time of printing and is subject to
change without notice or liability.
Reyco Granning ® reserves the right to modify the suspension
and/or procedures and to change specificat ions at any time without notice
and without incurring
obligation.
Reyco Granning ® uses the following types of notices for potential safety problems and to give
info rmation that will prevent damage to equipment.
WARNING
A warning indicates procedures that must be followed exactly. Serious personal injury
can occur if the procedure is not followed.
CAUTION
A caution indicates procedures that must be followed exactly. Damage to equipment or
suspension components and personal injury can occur if the pr ocedure is not followed.
NOTE
A note indicates an operation, procedure or instruction that is important for correct
service.

IDENTIFICATION
- 6 -
Identication
The suspension model and serial number are stamped on an aluminum tag that is riveted
to the front of the suspension sub -frame assembly (Figure 1). The serial number is used by
Reyco Granning ® for control purposes and should be referred to when servicing the
suspension or requesting technical support (Figure 2).
Figure 1 - Suspension Identification Location
Figure 2 - Suspension Serial Number Tag

MODEL OPTIONS
- 7 -
Model Options
Orig inal Model Number Format R ev. 1
Model Model ID# GAWR(lb)
IFS1660S3 IFS1660S3 -[Options] 16,600
IFS1800S3
IFS1800S3 -[Options]
18,000
IFS2000S3 IFS2000S3 -[Options] 20,000
Original Model Options Key R ev. 1
Option Disc
Brakes
Height Control
Valve
Sensor Height
Control
Sway
Bar
Bilstein
Shocks
Koni
Shocks
Original
System
Std
Dual
Std
Single
w/-SB
Dual
-SHC
Single
w/-SHCSB -SB
Std -F
Rev 1 Example :
ModelNumberFormat R ev. 2
Model Model ID# GAWR
(lb)
Wheel
Cut
IFS1700S3 IFS17S3 -##### 17,000 58°
IFS2000S3
IFS20S3 -#####
20,000
58°
Options Key R ev. 2
Current
System
Disc
Brakes
Model ID# Sux Position
1st - Height Control System
2nd - Stabilizer
3rd
4th - Shock Absorbers
1 2 3 4 5 S N 1 or 2 1 2 3
Option STD
Single
Valve
Dual
Valve
Single
Sensor
Dual Sensor
Hadley
Dual Sensor
Valid
Sway
Bar
No Sway
Bar
Steering
Shaft Kit
Hardware
Only
Bilstein Koni
1) A ‘0’ in Su x Positions 1,3, or 4 indicates “None”
2) Not all Combinations of Options are Valid Model ID’s, Contact RG Sales and/or Engineering for
Availability
3) 5
th
digit denotes non - serviceable options and is purposely excluded from this Table
REV 2 Examp le:
IFS1660 S3 -SB
16,600 lb
S3
3rd Gen
Integrated Steering GB
-SB
Swaybar
Single HCV
IFS1701- 1 S A B 2
17,000 lb 1
Height Control
S
Swaybar
A
Steering Kit
B
Shock
Absorber
2
Base Unit &
Misc

MODEL OPTIONS
- 8 -
Current ModelNumberFormat R ev. 3
Model Model ID# GAWR(lb)
IFS1701 S3 IFS17 01S3 -##### 17,000
IFS20 S3 IFS20S3 -##### 20,000
Current ModelNumberFormat R ev. 3
Current
System
Disc
Brakes
Model ID# Su  x Position
1
st
- Height Control System 2nd - Stabilizer
3rd and 4 th -
Shock Absorber
5th –
Wheel Cut
1 2 3 4 5 S N AA AB AC AD 1 2
Option STD
Single Valve Dual Valve Single Sensor Dual Sensor Hadley Dual Sensor Valid
Sway Bar
No Sway Bar Bilstein Variant 50° 55°
1) A ‘0’ in Su x Positions 1,3, or 4 indicates “None”
2) Not all Combinations of Options are Valid Model ID’s, Contact RG Sales and/or Engineering for
Availability
3) 5
th
digit denotes non - serviceable options
REV 3 Examples :
IFS20S3- 1 S AA 2
20,000 lb
1
Height
Control
S
Swaybar
AA
Shock
Absorber
2
Wheel Cut