SERVICE INFORMATION 00-1 STEERING, SUSPENSION, WHEELS AND TIRES SECTION 00 SERVICE INFORMATION Contents TROUBLE SHOOTING ......................................... 00-2 Steering System ................................................ 00-2 Front and Rear Suspension............................... 00-6 Wheels............................................................... 00-7 Tires................................................................... 00-7 MAIN DATA AND SPECIFICATIONS .................
00-2 SERVICE INFORMATION TROUBLE SHOOTING Steering System PROBLEM POSSIBLE CAUSE CORRECTION Objectionable “Hiss” Noisy relief valve. There is some noise in all power steering systems. One of the most common is a hissing sound most evident at standstill parking. Hiss is a high frequency noise similar to that experienced while slowly closing a water tap. The noise is present in every valve and results from high velocity fluid passing valve orifice edges.
SERVICE INFORMATION 00-3 PROBLEM Excessive Play or Looseness in the Steering System (Steering Wanders) POSSIBLE CAUSE CORRECTION 1. Front wheel bearing loosely adjustment. 1. Adjust the bearing or replace with new parts as necessary. 2. Worn coupling or steering shaft joints. 2. Replace. 3. Worn steering linkage ball joints. 3. Replace steering linkage. 4. Worn upper or lower ball joints. 4. Replace ball joints. 5.
00-4 SERVICE INFORMATION PROBLEM Vibration and Shimmy POSSIBLE CAUSE 1. Seal damage and leakage resulting in loss of lubricant, corrosion and excessive wear. 1. Replace damaged parts as necessary. 2. Tires, wheels, or brake drums out of balance. 2. Balance the tires and wheels, preferably with an on-vehicle type balancer, as this method balances the entire wheel and drum assembly. 3. Bent wheel or out of bound tire. Wheel nuts torqued unevenly. 3.
SERVICE INFORMATION 00-5 PROBLEM Pump Inoperative, Poor, or No Assist (Hard Steering) POSSIBLE CAUSE CORRECTION 1. Low oil level. 1. Fill the reservoir to the proper level. 2. Air in the oil. 2. Locate the source of the air leak and correct it. 3. Defective hoses or steering gear. 3. Repair or replace. 4. Flow control valve stuck. 4. Repair or replace. 5. Loose nut in end of flow control valve. 5. Torque nut. 6. Pressure plate not flat against ring. 6. Repair or replace. 7.
00-6 SERVICE INFORMATION PROBLEM Poor Return of the Steering Wheel Snapping or Chucking in the Steering Column or Wheel Excessive Road Shock POSSIBLE CAUSE CORRECTION 1. Lack of lubrication in the linkage. 1. Lubricate the linkage. 2. Steering gear to column misalignment. 2. Align the steering column. 3. Tires not properly inflated. 3. Inflate to the specified pressure. 4. Improper front wheel alignment. 4. Check and adjust as necessary. 5. Steering linkage binding. 5. Replace the pivots. 6.
SERVICE INFORMATION 00-7 PROBLEM Excessive Road Shock POSSIBLE CAUSE CORRECTION 1. Tire air pressure too high. 1. Deflate to correct pressure. 2. Wheel bearings adjusted too loose. 2. Adjust bearings. 3. Camber adjustment incorrect (Negative camber contributes to road shock). 3. Adjust camber. 4. Weak or broken spring. 4. Replace spring. 5. Defective shock absorbers. 5. Replace shock absorbers. 6. Loose suspension components. 6. Inspect, adjust or repair and replace as necessary.
00-8 SERVICE INFORMATION PROBLEM POSSIBLE CAUSE CORRECTION Cracked or Broken Wheel Discs (Cracks Develop in the Wheel Disc from Handhole to Rim, or from Handhole to Stud) Metal fatigue resulting from overloading. Replace wheel. Check position of wheel on vehicle for working load specifications. Damaged Stud Holes (Stud Holes Become Worn, Elongated or Deformed, Metal Builds up Around Stud Hole Edges, Cracks Develop from Stud Hole to Stud Hole) Loose wheel mounting.
SERVICE INFORMATION 00-9 PROBLEM Excessive Tire Wear Dual Tires Rubbing POSSIBLE CAUSE CORRECTION 1. Improper tire pressure. 1. Properly inflate to recommended pressure. 2. Incorrect tire/wheel usage. 2. Install correct tire/wheel combination. 3. Defective shock absorbers. 3. Repair or replace. 4. Front end out of alignment. 4. Align front end. 5. Loose, worn or damaged steering linkage, joints, suspension components, bushing and ball joints. 5. Inspect, repair or replace as required.
00-10 SERVICE INFORMATION MAIN DATA AND SPECIFICATIONS Front End Alignment Wishbone Suspension NHR Rigid NKR Rigid NPR NQR NPS 38.0° 37.5° 38.5° (7.00-15 Tire) 47.5° (7.00-16 Tire) 42.5° (7.50-16 Tire) 37.5° 35.5° (7.00-16 Tire) 42.5° (7.50-16 Tire) 36.5° (8.25-16 Tire) 29.5° (7.00-15 Tire) 35.0° (7.00-16 Tire) 32.7° (7.50-16 Tire) 27.9° (7.00-16 Tire) 32.7° (7.50-16 Tire) 30.0° (8.25-16 Tire) Steering Angle Inner (deg.) Outer (deg.) 35.0° 33.0° 29.
SERVICE INFORMATION 00-11 Power Steering Oil Pump Unit 4J Series Engine Type Vane type Theoretical Delivery (cm3 Regulated Oil Flow volume (liter/min) Regulated Oil Pressure 4H Series Engine kPa /rev) 8.1 8.5 — 6.5 8.0 — 6.5 10,297 (105/1,493) 10,297 (105/1,493) (kg/cm2/psi) NHR, NKR Maximum Allowable Speed 7.2 NPR, NPS 10,787 (110/1,564) NQR 11,278 (115/1,635) (r.p.
00-12 SERVICE INFORMATION SERVICE STANDARD ITEMS SERVICE STANDARD SERVICE LIMIT Power Steering Sector Shaft Outside Diameter mm (in) RHD&LHD Play between Sector Shaft and Bearing 39,975 (1.574) mm (in) RHD — 0.12 (0.0047) LHD — 0.20 (0.0080) Backlash between Sector Shaft and Ball Nut mm (in) RHD&LHD Steering Wheel Free Play Power Steering Fluid Pressure (at idling engine speed) 0.12 (0.0047) mm (in) 10 — 50 (0.4 — 2.
SERVICE INFORMATION 00-13 ITEMS Clearance between Shackle Pin and Bushing mm (in) SERVICE STANDARD SERVICE LIMIT 0.1 (0.0039) 0.5 (0.
00-14 SERVICE INFORMATION SERVICING Steering System Hose Replacement Replace the power steering hoses at intervals of fluid change. Manual Steering Gear Oil 1. Remove the filler plug on the steering unit (1). N3A0003E N3A0001E 2. Fill the gear box to the level of filler plug with specified gear oil through the filler hole. 3. Install and tighten the filler plug. N3A0004E N3A0002E Power Steering Fluid Draining 1. Jack up the front wheels until they are clear of the ground. 2.
SERVICE INFORMATION 00-15 begin to move with the front wheels properly in the straight ahead position. Notice: If the vehicle is equipped with a power steering unit, the wheel free play should be checked with the engine runing. Steering Wheel Free Play Manual Steering: 10 — 30 mm (0.4 — 1.2 in) Power Steering: 10 — 50 mm (0.4 — 2.0 in) 2. Also check the steering wheel for play and looseness in mount by moving it back and forth and sideways.
00-16 SERVICE INFORMATION N3A0007E Steering Function Check the following items. • Steering wheel shake • Steering shimmy • Hard steering • Turning radius • Steering wheel return • Steering pull to one side Inspection of Wheel Alignment N3A0010E 1. Set front wheels to its straight ahead position. 2. Align the toe-in gauge with center height of each wheels at front end. 3. Apply center marks to each wheel, then take measurement of distance A between the center marks on each wheel. 4.
SERVICE INFORMATION 00-17 • Rigid Suspension • Wishbone Suspension N3A0012E • NPS N3A0014E Adjustment 1. Loosen the lock nuts on the tie rod or outer truck rod ends. 2. Adjust length of the tie rod by turning the connecting rod on outer truck rod. 3. Tighten the lock nuts to specified torque. Tighten: • Lock nut to Rigid Suspension, NPS: 113 N⋅m (11.5 kg⋅m / 183 lb⋅ft) Wishbone Suspension: 167 N⋅m (17.
00-18 SERVICE INFORMATION • NPS N3A0018E N3A0016E • Wishbone Suspension Steering Angle Wishbone Suspension Model Vehicle Model NKR (7.00-15 Tire) (deg.) Outer Inner 35.0 38.0 Rigid Suspension Model Vehicle Model (deg.) Outer Inner NHR 33.0 37.5 NKR (7.00-15 Tire) 29.5 38.5 NKR (7.00-16 Tire) 27.9 35.5 NPR (7.00-16 Tire) 35.0 47.5 NPR, NQR (7.50-16 Tire) 32.7 42.5 NQR (8.25-16 Tire) 30.0 36.5 NPS 29.8 37.5 N3A0017E Turning Radius 1.
SERVICE INFORMATION 00-19 Adjustment 1. Loosen the lock nuts on the steering knuckle or the axle case. 2. Adjust projecting height of the stopper bolts. 3. Tighten the lock nuts to specified torque. • Wishbone Suspension Tighten: • Stopper bolt to Rigid suspension: 186 N⋅m (19.0 kg⋅m / 137 lb⋅ft) NPS: 49 N⋅m (5.1 kg⋅m / 36 lb⋅ft) Wishbone suspension: 82 N⋅m (8.4 kg⋅m / 61 lb⋅ft) • Rigid Suspension N3A0022E Camber Angle All Model except NPS Toe-in can be checked on the gauge simultaneously. 1.
00-20 SERVICE INFORMATION NPS Remove the free wheel hub lock cover assembly, then install gauge adapter on end of the knuckle spindle. Install camber, caster and king pin inclination gauge on end of gauge adapter. Gauge Adapter: 5-8840-2188-0 • NPS N3A0026E Caster Angle and King Pin Inclination N3A0024E Legend 1. Camber angle 2. Gauge adapter 3. Wheel alignment tester 3. Reading of the camber scale directly indicates the camber angle (1).
SERVICE INFORMATION 00-21 • NPS N3A0030E N3A0028E Legend 1. Caster angle 2. King pin inclination • Wishbone Suspension 3. Turn the steering wheel in the opposite direction until the front wheels are steered 20 degrees in the opposite direction. Reading of the caster and king pin scales directly indicates the caster and king pin inclination angles being checked. Caster Angle and King Pin Inclination N3A0029E (deg.
00-22 SERVICE INFORMATION Legend 1. Caster angle 2. King pin inclination Adjustment Rigid Suspension The camber, caster and king pin inclination are built into front end and are not adjustable. If the camber, caster or king pin inclination is found to be out of alignment, check to locate the cause of trouble against the listing below and replace the parts necessary.
SERVICE INFORMATION 00-23 N3A0035E N3A0037E Front and Rear Suspension Suspension Function Check the following items. • Leaf spring breakage • Body inclination • Reduction of ground clearance Lubrication Lubricate the following points with multi- purpose type grease. • Spring Pin (NPS only) N3A0036E Measurement of Side Slippage When inspection and adjustments of toe-in, camber, caster and king pin inclination are completed, check for side slippage using a side slip tester.
00-24 SERVICE INFORMATION • Shackle Pin (NPS only) N3A0042E N3A0040E • Upper Arm (for Wishbone Suspension) N3A0043E N3A0041E Wheel and Tires Wheel Nut Retightening Retighten the wheel nuts to specified torque in sequence as shown in the figure.
SERVICE INFORMATION 00-25 Tread Wear Indicators The original equipment tires have built-in tread wear indicators to show when tires need replacement. These indicators may appear as wide bands. When the indicators appear in two or more grooves at three locations, tire replacement is recommended.
00-26 SERVICE INFORMATION Tire Rotation To allow the tires to wear evenly and to prolong their life, exchange the front and rear tire locations as shown in the figure. N3A0045E Legend A. For bias tires B. For radial tires C.
SERVICE INFORMATION 00-27 Tire Inflation Pressure Tire pressure, in cold condition (after vehicle has set for three hours or more, or driven less than one mile), should be checked monthly or before any extended trip. Tire pressure increases approx. 15% when the tires become hot during driving. The pressure specification is shown on the label as figure. N3A0047E Legend 1.
00-28 SERVICE INFORMATION FIXING TORQUE Steering Unit, Pitman Arm and Drag Link N3A0461E (This illustration is NHR and NKR model.
SERVICE INFORMATION 00-29 Power Steering Unit N3A0462E (This illustration is based on RHD model. Illustration for LHD model are symmetrically opposite.
00-30 SERVICE INFORMATION Power Steering Pump N3A0051E Legend A. 4J series engine B.
SERVICE INFORMATION 00-31 Power Steering Pump Assembly N3A0463E Legend A. 4J series engine B.
00-32 SERVICE INFORMATION Tandem Hydraulic Pump N3A0054E
SERVICE INFORMATION 00-33 Manual Steering Unit N3A0055E Legend A. NHR, NKR B.
00-34 SERVICE INFORMATION Steering Linkage (Rigid Suspension) N3A0056E Legend A. NHR, NKR, NPR B. NPS C.
SERVICE INFORMATION 00-35 Steering Linkage (Wishbone Suspension) N3A0058E
00-36 SERVICE INFORMATION Steering Column N3A0060E
SERVICE INFORMATION 00-37 Front Leaf Spring and Shock Absorber N3A0442E Legend A. NHR, NKR B.
00-38 SERVICE INFORMATION Upper, Lower Link, Torsion Bar and Strut Bar (Wishbone Suspension) N3A0062E
SERVICE INFORMATION 00-39 Front Stabilizer N3A0443E Legend A. NKR B. NPR C.
00-40 SERVICE INFORMATION Rear Leaf Spring and Shock Absorber N3A0444E Legend A. NHR, NKR B.
SERVICE INFORMATION 00-41 Rear Stabilizer N3A0445E
00-42 SERVICE INFORMATION SPECIAL TOOLS Steering System Illustration Illustration Tool Number / Description / Remarks 5-8840-0162-0 / Power steering fluid pressure gauge Tool Number / Description / Remarks 5-8840-2052-0 / Steering lock nut wrench / for Manual steering (NHR, NKR) 5884020520 5884001620 5-8840-2053-0 / Wrench / for Manual steering (NHR, NKR) 5-8840-2017-0 / Ball joint remover 5884020530 5884020170 5-8840-2018-0 / Tie rod end remover / for 2WD rigid suspension (assistant side) 5-8840-
SERVICE INFORMATION 00-43 Suspension Illustration Illustration Tool Number / Description / Remarks 5-8840-2048-1 / Leaf spring bushing remover and installer Tool Number / Description / Remarks 5-8840-2367-0 / Lower link bushing remover and installer / for wishbone suspension 5884023670 5884020480 5-8840-2049-1 / Leaf spring bushing remover and installer / for metal bushing 5884020490 5-8840-2366-0 / Lower link ball joint remover / for wishbone suspension 5884023660 5-8840-2364-0 / Upper link ball
