Reassembly; Re-Assembling The Hydraulic Head - Takeuchi TB 175 Handbuch

3.3. Reassembly

3.3.1. Re-assembling the hydraulic head

Install the plunger.
Upper lead
Ball
Note that the positional relationship of the upper
lead and sub-lead of the plunger and the ball of
the control sleeve is as shown below. (Plunger
identification marking (such as "W4") and the ball
of the control sleeve are oriented in the same
direction.)
Be careful that the plunger is NOT inserted
upside down.
Install the control sleeve and spring retainer.
Sub-lead
Identification marking
Install the rack guide.
Rack guide
Control sleeve
Distribution shaft sleeve
Attaching rack and rack guide
When installing rack guide, push it against the
distribution shaft sleeve and upper spring retainer so
that the rack is in parallel with the direction of
camshaft. (T = 3 to 4 N
Movable range of rack is to be equal to or larger
than ±7 mm.
Fix the rack at the position of L = 25, and measure
the effective stroke and sub-step (overflow stroke) to
check that they are within the standards (Refer to
attached drawing 1.)
The rack must not separate from the ball of the
control sleeve within the movable range.
Fix the plunger with a jig and measure the total
backlash. (To be equal to or less than 0.2 mm)
The load of rack auxiliary SP must be able to return
the rack from the maximum decreased position to
the maximum increased position).
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Rack auxiliary SP
L
Upper spring retainer
m)
•
Rack