it sounds like I need my servo motor needs adjusted. see below. borrowed from another post on here.
4000 Series-HST Creep Solution
{JD Service Bulletin from John Deere 4000 Club Forum}
John Deere 4000 Series Club
Solution Number: 46610
Doc ID: LV46610
Solution Summary: SIB 00-11-35-1 - 4000 Series CUT Tractor With HST Will Creep
Publication Date: Apr 10 2000
Product Affected:
Model 4600 and 4700 HST CUT Tractors:
4600H (160001- 366100)
4600E (166001-369100)
4700H (175001-175186)
Complaint or Symptom:
The tractor creeps forward or reverse when the control pedals are released.
Problem:
1. The hydrostatic control pedal linkage is out of adjustment and will not return to neutral.
2. The hydrostatic servo motor is out of adjustment and will not return to neutral.
Solution:
To determine which problem is at fault:
Disconnect the yoke to bracket. (Fig. 1)
NOTE: Refer to Bulletin 00-11-35-1 for figures 1, 2 and 3.
Start the engine.
Place the shift lever in A range.
Run the engine at high idle.
1. If the tractor does not creep with the linkage disconnected, reconnect the yoke and adjust the linkage as follows:
A. Start the engine.
B. Place the range lever in A range.
C. Run the engine at high idle.
D. Slowly depress the REVERSE pedal to confirm travel is 13mm (0.5 In.) before the tractor begins to move.
E. If the pedal travel is out of adjustment, shut the engine OFF and engage the park brake.
CAUTION: Severe injury or death can result if the engine is not shut off when performing the neutral adjustment.
F. Locate the roller bearing and cam follower under the platform on the right side. (Fig. 1)
NOTE: The roller bearing is attached to an eccentric that must be turned to perform the following adjustments.
G. To change the amount of free play, loosen the locking nut that holds the eccentric to the reverse shaft. (Fig. 2)
H. Use a wrench to rotate the eccentric to move the roller bearing forward or rearward.
1) Forward increases free play.
2) Rearward decreases.
I. Tighten the locking nut.
J. Start the engine, run at high idle and disengage the park brake.
K. Slowly depress the REVERSE pedal to assure travel is 13mm
(0.5 In.) before the tractor begins to move.
L. Repeat steps G through K until the roller to cam is within specification.
M. Move the forward and reverse pedals and listen for the neutral switch "click" when the pedals are released.
NOTE: Engine will not start if the neutral switch does not close when the pedals are released.
N. If no click is heard, adjust the neutral switch to open with 6-9mm (0.25-0.38 In.) of pedal travel.
2. If the tractor moves after the linkage is adjusted, obtain the LVA10365 Hydro Adjustment Kit to adjust the servo motor.
NOTE: The kit provides an instruction to cut an access hole in the clutch housing to provide access to the servo motor adjustment. (Fig 3)
Parts:
LVA10365 1 Kit, Hydro Adjustment
JDG1291 1 Set, Neutral Creep Adjustment Tool (ServiceGard)
Additional Information:
1. JDG1291 Tool Set is required and an essential ASSET tool.
2. The clutch housing access hole was incorporated on HST equipped 4600 and 4700 tractors after the PIN range listed in the heading of this bulletin.