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Old 04-06-2013, 12:19 AM   #1
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1996 33' Land Yacht
RANCHO CORDOVA , California
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Auto-park problem

96 33' land yacht. Auto-park problem. Has anyone ever changed the switch in the shift linkage up behind the dash? Mine is erratic and causes the auto park to engage suddenly. A real problem. My local chevy dealer wants $200.00 plus a week out on delivery. Has anyone else had this problem. I just had my leaky acuatator overhauled by Jose in Florida. Ay help on this subject would be welcome. Jim
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Old 04-06-2013, 01:51 PM   #2
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Jim, I fixed your title for you.
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Old 04-06-2013, 03:28 PM   #3
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You are stretching my brain, but I don't recall it being too hard a job on the commercial units anyway. The moho might have a bunch of stuff in the way which would be the hard part. I sort of remember an adjustment procedure that has to be followed in sequence with the other cable adjustments......but it has been too long to recall accurately. You'll need a manual.....I don' think i have access to that old stuff anymore.
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Old 04-06-2013, 03:40 PM   #4
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Is this what you need?



Service Information




1997 Chevrolet P42 Commercial Chassis | P32/42/52/62 Chassis Service Manual | Bulletins By Category | Technical | Document ID: 50879
Hydraulic Auto Apply Cam-actuated Switch
Removal Procedure
  1. Move the column shift lever to P (Park).
  2. Disconnect the connector from the end of the switch.
  3. Remove the jam nut from the threaded portion of the switch.
  4. Remove the switch from the bracket assembly.
Installation Procedure
  1. Install the switch into the bracket assembly.
  2. Install the jam nut. Do not secure the nut.
  3. Connect the connector.
Adjustment Procedure
  1. Insert a ⅜ inch drill bit through holes A and B. If the drill bit does not slide through the aligning holes, refer to Hydraulic Auto Apply Control Rod Adjustment before continuing with this procedure.
  2. Adjust the switch so that the plunger makes contact with the clevis pin and the clevis pin makes contact with the cam assembly. Do not compress the plunger of the switch more than 0.5 mm (0.020 in) in this position.
  3. Secure the jam nut and the lock washer securely to the bracket assembly.
  4. Remove the drill bit.
  5. Lubricate the clevis pin and the plunger face contact points with multi-purpose lubricant.
  6. With the ignition ON, move the shift lever from P (Park) and check the parking brake operation.
  7. Repeat the procedure if necessary.


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Old 04-06-2013, 03:41 PM   #5
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And here is the control rod procedure referenced in the first post.


Service Information




1997 Chevrolet P42 Commercial Chassis | P32/42/52/62 Chassis Service Manual | Bulletins By Category | Technical | Document ID: 50881
Hydraulic Auto Apply Control Rod Adjustment
  1. Move the column shift lever to P (Park).
  2. Loosen the jam nuts on the adjusting rod.
  3. Adjust the rod ends on the adjusting rod until ⅜ inch drill bit slides through holes A and B.
  4. Secure the jam nuts to the rod ends.
  5. Adjust the cam-actuated switch. Refer to Hydraulic Auto Apply Cam-actuated Switch
  6. Check the operating and holding ability of the parking brake.
  7. Repeat the procedure if necessary.


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Old 04-06-2013, 03:45 PM   #6
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Here is the cable adjustment procedure. If you can't get the desired travel, look for worn cable levers. This was an issue with commercial vans, but they got cycled 50 - 75 times a day....mohos....maybe 5 times ad day for a couple dozen or so days a year

Service Information




1997 Chevrolet P42 Commercial Chassis | P32/42/52/62 Chassis Service Manual | Bulletins By Category | Technical | Document ID: 50878
Hydraulic Auto Apply Actuator Cable Adjustment
Adjustment Procedure
  1. CAUTION:: If the actuator will not hold pressure, do not unthread the parking brake cable from the actuator piston. The cable is under tension and unthreading the cable will cause the cable to spring and can result in personal injury.
  2. Block the vehicle's wheels.
  3. Turn the ignition ON.
  4. Place the shift lever in N (Neutral).
  5. Loosen the parking brake jam nut on the actuator assembly.
  6. Adjust the cable fitting until tension is obtained.
    Tighten
    Tighten the jam nut to 45 Y (33 lb ft). Refer to Fastener Notice in General Information.
  7. Place the shift lever in P (Park).
  8. Measure the actuator cable/piston rod stroke. The distance must be between 30 mm (1.20 in) and 37 mm (1.44 in) while moving the shift lever from P (Park) to N (Neutral).
  9. Remove the wheels blocks.
  10. Check the operating and holding ability of the parking brake.
  11. Repeat the procedure if necessary.
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Old 04-06-2013, 04:04 PM   #7
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FYI. All the links above say: "You are not authorized to view the requested information" when you try to click on them. First two pics only show up as empty boxes.
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Old 04-06-2013, 04:13 PM   #8
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Yes, I know. It is a password protected GM employee/dealer site, so the links will never work in what I post here....all I can do for you is copy and paste. That causes a lot of issues....like missing pics.

We did not expend a lot of resources on the old information when we went paperless in about 2005, thus the less than stellar online performance.

1997 is the oldest P-chassis manual I can access....but they really didn't change much for many years before that.

I can, however, see bulletins older than 1997.
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