Toro Workman HDX Auto Service Manual page 65

Disassembly (Fig. 24)
1. Remove speed limiter assembly with attached hy-
draulic hose from primary clutch (see Speed Limiter As-
sembly in this section).
2. Thoroughly clean speed limiter control cover before
disassembly.
3. Move speed range lever on seat base console out of
the transport position to reduce fluid leakage from speed
control system.
NOTE: If only replacing rotary union O−rings, the rotary
union can be removed without disconnecting speed con-
trol hose. Remove three (3) button head screws (item 2)
and slide rotary union with attached hose and retainer
from control cover (Fig. 25).
4. Separate speed control hose (item 1) from rotary
union (item 5) by holding fitting on speed control hose
and loosening hex on rotary union. Discard banjo wash-
er (item 4).
5. Remove three (3) button head screws that secure re-
tainer (item 3) to speed limiter control cover. Remove re-
tainer.
6. Slide rotary union (item 5) and hydraulic piston (item
10) out of speed limiter control cover.
7. Remove and discard quad ring (item 9) from piston,
U−cup (item 8) from control cover and O−rings (item 6)
from rotary union.
8. Thoroughly clean and inspect all speed limiter con-
trol cover components.
Assembly (Fig. 24)
1. Lubricate quad ring (item 9), U−cup (item 8) and
O−rings (item 6) with clean DOT 3 brake fluid. Carefully
install quad ring onto piston, U−cup into cover and
O−rings onto rotary union. Make sure that seals are
completely seated into component grooves.
2. Lubricate piston with clean DOT 3 brake fluid.
3. Place piston installation tool (see Special Tools in this
chapter) in bore of speed limiter control cover. Using fin-
ger pressure, slide lubricated piston through piston
guide and insert piston into control cover.
Workman HDX Auto
5
4
3
1. Speed limiter cover
2. Retainer
3. Screw (3)
4. Put small amount of clean DOT 3 brake fluid into bore
of speed limiter control cover before installing rotary
union.
5. Slide lubricated rotary union into speed limiter control
cover.
6. Position retainer (item 3) onto speed limiter control
cover and secure with three (3) button head screws
(item 2). Tighten screws evenly so the retainer has a uni-
form gap all the way around.
7. Position new banjo washer onto rotary union fitting.
NOTE: Proper torque of rotary union fitting will require
the use of an offset wrench (e.g. crowfoot wrench). Use
of an offset wrench will affect torque wrench calibration
due to the effective length change of the torque wrench.
Tightening torque when using a torque wrench with an
offset wrench will be lower than the listed installation tor-
que (see Using a Torque Wrench with an Offset Wrench
in the Torque Specifications section of Chapter 2 − Prod-
uct Records and Maintenance).
8. Thread rotary union into speed control hose fitting
and tighten. Torque rotary union hex from 108 to 132 in−
lb (12.3 to 14.9 N−m).
9. Bleed speed control system (see Bleed Speed Con-
trol System in this section).
10.Install speed limiter assembly with attached hy-
draulic hose to primary clutch (see Speed Limiter As-
sembly in this section).
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1
2
Figure 25
4. Rotary union
5. Speed control hose
Drive Train