Technical Information · issue 38 of 2002
Gear mechanism; Sprocket cover; Oil tank; HT safety harness (not for HTE 60); Angle gear (special accessory); Service note HT 75; Summary
IssueTI 38/2002
Part changes (2)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 4138 640 0114 | 4138 640 0120 | 4138 640 0114 have been replaced by the new versions 4138 640 0120 and 4138 640 0116. |
| 4138 640 1700 | 4138 640 1701 | The sprocket cover 4138 640 1700 has been replaced by the new version 4138 640 1701. |
Full text
Page 1 of 3
Technical Information
38.2002
STIHL HT 70, HT 75, HT, HT-KM Pole Pruners – Series 4138
STIHL HT 73 Pole Pruner – Series 4142
Contents
1. Gear mechanism
2. Sprocket cover
3. Oil tank
4. HT harness
5. Service note HT 73, HT 75
6. Summary
1. Gear mechanism The new sprocket cover includes an additional
The two gear mechanisms 4138 640 0111 and
opening at the top for better discharge of the wood
chips.
4138 640 0114 have been replaced by the new
versions 4138 640 0120 and 4138 640 0116.
The transmission ratio of the gear mechanisms has
been changed from 0.8 to 1.2. This yields a lower
chain speed and higher torque.
A new sprocket with six teeth is now available. This
further increases the torque at the chain.
The existing sprocket with seven teeth will remain
available as a spare part.
386TI006 KN
2. Sprocket cover
Left: previous sprocket cover
Right: new sprocket cover
The chain catcher pin is now integrated into the
cover. Its position has been changed by 1.6 in
(40 mm). This enlarges the opening at the bottom
and improves chip discharge.
386TI000 KN
Left: previous sprocket cover
Right: new sprocket cover
The sprocket cover 4138 640 1700 has been
replaced by the new version 4138 640 1701.
TI_38_2002_02_01_01.fm english / USA
)m~ge 2 Technical Information 38.2002
3. Oil tank 4. HT harness
386TI002 KN
Left: previous oil tank
Right: new oil tank
The oil tank 4138 351 0300 is new and re-designed.
The new oil tank has a new filler cap.
The tank capacity has been increased by
approx. 70 %.
386TI004 KN
The wall strength has been improved. The new oil
tank is sealed against the gear housing by the
gasket 4138 351 1000. The oil tank is screwed onto
the gearbox at four points.
The new HT harness 4138 710 9000 is now
Service note: available so that the pole pruner can be carried
The four screws on the oil tank must be tightened more comfortably.
crosswise during assembly. Tightening torque 6 Nm It includes a sling to support the power unit of the
(50 in-lbs). pole pruner. This permits an ergonomic working
The new oil tank requires a new strainer position. The sling is supported on the operator's
1117 647 6801 and connector 4138 353 2700. The thigh.
strainer 1117 647 6801 has a larger surface and The thigh strap and carrying strap can be adjusted
as required.
therefore a longer interval between cleanings.
5. Service note HT 73, HT 75
When mounting the shaft on the HT 73 and HT 75,
care must be taken to ensure that the snap ring
9458 621 1130 (arrow) is correctly inserted in the
groove of the drive shaft.
386TI008 KN
Strainer 1117 647 6801 (right) mounted in the
connector 4138 353 2700
386TI005 KN
TI_38_2002_02_01_01.fm Page 2 of 3
Technical Information 38.2002 Page 3
6. Summary
Item Part name Previous New Remarks
HT 70, HT, HT-KM only:
1 Gear mechanism, including Item 3 4138 640 0111 4138 640 0120 1)
2 Sprocket 3/8" Picco, 7 teeth 1206 642 1301 --- 1)
3 Sprocket 3/8" Picco, 6 teeth --- 4138 642 1201
HT 73, HT 75 only:
4 Gear mechanism, including Item 6 4138 640 0114 4138 640 0116 1)
5 Sprocket 3/8" Picco, 7 teeth 4138 642 1350 --- 1)
6 Sprocket 3/8" Picco, 6 teeth --- 4138 642 1250
All versions
7 Oil tank 4138 350 4400 4138 351 0300 1)
8 Oil filler cap 1206 640 3600 0000 350 0526 1)
9 Gasket --- 4138 351 1000
10 Sprocket cover 4138 640 1700 4138 640 1701 1)
11 Strainer 4138 351 9300 1117 647 6801 1)
12 Rubber buffer 4138 353 2900 1)
13
14
Connector
Valve
---
---
fo 4138 353 2700
1128 640 9100
15 Full harness HT, --- 4138 710 9000
including Items 16, 17
16 Full harness --- 4134 710 9004
17 Sling --- 4138 790 2800
Modification to be introduced: continuously
Remarks
1) Previous version of part remains available for older machines
Last Technical Information on models STIHL HT 70, HT 73, HT 75, HT, HT-KM: 16.2001, 32.2001
© 2002 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-ja 7670
TI_38_2002_02_01_01.fm Page 3 of 3
Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.