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Home >> Lincoln >> 2004 >> Navigator RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1681 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Mechanical Shift >> Pinpoint Tests >> Pinpoint Test F: Mechanical Shift On Stop (MSOS) Functional Test >> Pinpoint Test F: Mechanical Shift On Stop (MSOS) Functional Test

Pinpoint Test F: Mechanical Shift On Stop (MSOS) Functional Test

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4x4 high/low (4H/4L) is not intended for driving on hard/dry surfaces.
  1. F1 CHECK FOR 2H INDICATION 
    • Key in ON position.
    • Shift the transfer case shift lever to 2H.
    • Observe the 4x4 and Low Range indicators.
    • Are both indicators off? 
    1. YES  : Go to  F2.
    2. NO  : Go to Pinpoint Test A .
  2. F2 CHECK THE MANUAL HUBLOCK OPERATION 
    • Turn the LH and RH hublocks to the LOCK position.
    • Do the hublocks turn to the LOCK position? 
    1. YES  : Go to  F3.
    2. NO  : INSTALL a new manual hublock as necessary. REFER to Hublock  in this article. TEST the system for normal operation.
  3. F3 CHECK FOR MECHANICAL ENGAGEMENT IN 2H 
    • Drive the vehicle in tight turns on a hard surface.
    • Check for the presence of driveline wind-up and tire scuff.
    • Is driveline wind-up and tire scuff present? 
    1. YES  : Go to Pinpoint Test B .
    2. NO  : Go to  F4.
  4. F4 VERIFY THE SHIFT TO 4H 
    • Shift the transfer case shift lever to 4H.
    • Did the transfer case shift lever shift to the 4H position? 
    1. YES  : Go to  F6.
    2. NO  : Go to  F5.
  5. F5 ATTEMPT TO MECHANICALLY ASSIST 4H SHIFT 
    • While rolling at speed below 5 kph (3 mph), shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 4H position while the vehicle is rolling at a speed below 5 km/h (3 mph).
    • Did the transfer case shift lever shift to the 4H position? 
    1. YES  : Go to  F6.
    2. NO  : Go to Pinpoint Test B .
  6. F6 CHECK MECHANICAL ENGAGEMENT OF 4H 
    • Drive the vehicle in tight turns on a hard surface.
    • Check for the presence of driveline wind-up and tire scuff.
    • Is driveline wind-up and tire scuff present? 
    1. YES  : Go to  F7.
    2. NO  : Go to Pinpoint Test B .
  7. F7 CHECK THE 4X4 INDICATOR 
    • Observe the 4x4 indicator.
    • Is the 4x4 indicator illuminated? 
    1. YES  : Go to  F8.
    2. NO  : Go to Pinpoint Test A .
  8. F8 VERIFY THE SHIFT TO 4L 
    • With the vehicle stationary, shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to 4L.
    • Did the transfer case shift lever shift to 4L? 
    1. YES  : Go to  F10.
    2. NO  : Go to  F9.
  9. F9 ATTEMPT TO MECHANICALLY ASSIST A SHIFT TO 4L 
    • While rolling at speed below 5 kph (3 mph), shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 4L position while the vehicle is rolling at a speed below 5 km/h (3 mph).
    • Did the transfer case shift lever shift to the 4L position? 
    1. YES  : Go to  F12.
    2. NO  : Go to Pinpoint Test C .
  10. F10 CHECK FOR MECHANICAL ENGAGEMENT OF 4L 
    • Execute tight turns on a hard surface.
    • Check for the presence of driveline wind-up, tire scuff and limited vehicle speed.
    • Is driveline wind-up and tire scuff present? 
    1. YES  : Go to  F11.
    2. NO  : Go to Pinpoint Test C .
  11. F11 CHECK THE LOW RANGE INDICATOR 
    • Observe the Low Range indicator.
    • Is the Low Range indicator illuminated? 
    1. YES  : Go to  F12.
    2. NO  : Go to Pinpoint Test A .
  12. F12 CHECK THE SHIFT FROM 4L TO 2H 
    • With the vehicle stationary, shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 2H position.
    • Did the transfer case shift lever shift to the 2H position? 
    1. YES  : Go to  F14.
    2. NO  : Go to  F13.
  13. F13 ATTEMPT TO MECHANICALLY ASSIST 4L DISENGAGEMENT 
    • Allow the vehicle to roll forward to eliminate shift blockage or driveline wind-up.
    • While rolling, shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 2H position at a vehicle speed below 5 km/h (3 mph).
    • Did the transfer case shift lever shift to the 2H position? 
    1. YES  : Go to  F14.
    2. NO  : Go to Pinpoint Test C .
  14. F14 CHECK THE MANUAL HUBLOCKS RETURN TO FREE 
    • Turn the LH and RH manual hublocks to FREE.
    • Will the hublocks turn to the FREE position? 
    1. YES  : Go to  F15.
    2. NO  : INSTALL a new manual hublock. REFER to Hublock  in this article. TEST the system for normal operation.
  15. F15 VERIFY THAT THE HUBLOCKS DISENGAGE IN THE FREE POSITION 
    • Lift and support the vehicle so that the front tires are a few inches off the ground. Refer to JACKING AND LIFTING article.
    • Rotate the LH front tire while observing the RH front axle shaft and U-joint.
    • Rotate the RH front tire while observing the RH front axle shaft and U-joint.
    • Does either axle shaft rotate? 
    1. YES  : INSTALL a new manual hublock on the axle shaft that rotated. REFER to Hublock  in this article. TEST the system for normal operation.
    2. NO  : Go to  F16.
  16. F16 VERIFY THAT THE TRANSFER CASE DISENGAGED MECHANICALLY 
    • Apply the parking brake.
    • Rotate the front driveshaft.
    • Does the front driveshaft rotate? 
    1. YES  : The four wheel drive (4WD) system is operating correctly.
    2. NO  : REPAIR the transfer case as necessary. REFER to TRANSFER CASE article. TEST the system for normal operation.
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