Synchroniser part in geatbox tractors

APH Forward / Reverse Synchroniser Set Up & Forward / Reverse and 4/5 Synchroniser Fork Set Up

السنكلونيزر أو المتزامن فى جيربوكس السرعات هو الذى ينظم حركة تعشيق الكلاتشات ونقل الحركة فى جيربوكس الجرار الزرارى الحديث مثل johndeere -case puma -class -massy -

The installation instructions for shimming the mid section of the transmission

This leads to confusion and incorrect installation.

صورة توضيحة لمكان تركيب متزامن السرعات 

Forward / Reverse Synchroniser Set Up

To ensure that the forward / reverse synchroniser support shaft components function correctly, it is necessary to have a clearance of 0.5 mm, this is obtained by installing shims behind the bearing retaining clamp and snap ring 'A'.

To prevent components binding under their own weight, it is recommended to carry out this shimming procedure in a vertical position. The rear end components must be installed, as well as the rear top shaft bearing retainer and mid-section cover plate, with all bolts tightened to the correct torque value.

Correct Installation Procedure:-  

Measure A (thickness of the bearing clamp), this measurement can be taken before the transmission is assembled.
(see Attachments 1 and 2)

Assemble all the parts including the clamp without any shims, and tighten the bolts progressively.  Ensure the forward / reverse components within the mid-section are at zero clearance by rotating and  “feeling”  them tighten slightly as the retaining clamp is tightened to 15Nm.

Measure B
B = The front face of the bearing clamp to the mid section front cover.

The required clearance for the components is 0.5 mm.

The shim thickness required is C + 0.5mm (Where C = B – A).

Install the desired shim pack between the bearing clamp and the bearing snap ring, then tighten the retaining clamp to 25Nm

Forward / Reverse and 4/5 Synchroniser Fork Set Up
(The adjustment procedure is the same for both rails)

Remove the top cover plate to gain access to the synchroniser forks.

A neutral position does not exist on either of the rails, remove the detent mechanism (‘D’, ball and plunger) for the selector fork rail

Using a suitable lever move the synchroniser towards the rear of the transmission into the fully engaged position, measure ‘F’ (See attachment 6). Move the synchroniser towards the front of the transmission into the fully engaged position, measure ‘G’. (See attachment 7)

Neutral Position = (F+G) / 2.

Locally manufacture a locking tool ‘E’  and insert in place of the normal detent mechanism

Insert the locking tool to centralise the rail. Carefully adjust the fork to the calculated neutral position being careful not to force the rail which could result in damaging the locking tool.

Tighten the fork locking screws to 27Nm, and the locking nuts to 22Nm.