The Repair Manual of SINOTRUK HOWO HW19710 Transmission 3

Section I Dismantle and Assemble of HW Series Transmission

Assembly

I. Basic Requirements of Dismantle of HW Series Transmission

Basic Requirements as Following:

① Be familiar with the assembly requirement, shape of settled parts, the location after

parts normal installation, and prevent to use any defect parts.

② Before installation, make good inspection of parts ensure the parts surface is clean

and not district manufactured defect, especially the combined surface is not burr,

bump and others, such as the matching surface of oil seal and transitional surface

when equipment and the gear surface shall not have distinct bump and other

damages.

③ Handle parts with care, not damage the parts surface, especially the important

combined surface.

④ Before installed the oil seal, lay on suitable lithium grease on the connected mouth

to protect it.

⑤ After installation, clear the copper crumbs on the parts surface to keep the surface

neatness if the parts surface is knocked on by copper hammer and others.

⑥ After installation, examine the parts to ensure it is installed in the correct position. If

debugging, please debug by requirement till meet the installation requirement.

⑦ Bolt installation: firstly put the bolt through the light hole or threaded hole, then wring

the bolt to the fixed surface 2-3 threads. Tighten the bolt on the cross, and use

torque wrench to measure the bolt torque to keep the techniques required torque.

⑧ Use suitable work position and tools to put parts neatly, not random to avoid being

knocked and accidental damage.

⑨ Keep the assemble site clean.

II Dismantle of the Transmission Assembly.

1. Fork Axle Dismantle of Push-type Clutch

Clean the transmission assembly, then put it on the ground with soft rubber mat (see

figure 3-1). Dismantle the fork bolt of transmission, then the flat key, take off fork

axle and fork to separate bearing, low pressure hose and grease cup (see figure

3-2)

2. Fork Axle Dismantle of Pull-type Clutch.

Dismantle the two tightening screws for fastening fork and fork axle (see Figure 3-3).

Take off the elastic ring of fork axle by circlip pliers (see Figure 3-4).

Lift up fork axle, the flat key on the fork axle low end will naturally drop. Take off the

flat key (see figure 3-5), dismantle carrier bolt of fork axle and take off the fork axle

carrier (see figure 3-6).

3. Dismantle the fork axle carrier (see figure 3-7) and oil inlet of shell, oil inlet of input

shaft and oil outlet assembly (see Figure 3-8)

4. Dismantle end cover assembly of input shaft (see Figure 3-9) and end cover of

supplementary axle (see Figure 3-10. when dismantle the end cover of

supplementary axle, use plain end screwdriver to prize on the bulges of this figure)

5. Dismantle six M10 bolts connected oil pump and front housing, not dismantle two

bolts connected front and back housing of oil pump (Figure 3-11 shown by circle).

Gently turn to the input shaft to drive supplementary axle moving, make the top

thread on the axle end of left supplementary axle direct to the gap on the shell of oil

pump (see Figure 3-12). Hold oil pump and outside forcibly dismantle the oil pump

assembly (if not easily dismantle, under the condition that ensure the top thread on

the end of left supplementary axle is direct to the gap of the shell of oil pump) use

M12X50 top thread to turn into the two screw holes directed by Figure 3-11 arrow to

push the oil pump out), take out of top thread from the end of left supplementary axle

(see Figure 3-13, arrow direction is the position of ball).

6. Pipe 2 in the box is clearance fit with front shell, it can be used screwdriver to hook

inside of the pipe 2 to pick it up (see Figure 3-14), and dismantle input shaft and stop

ring of supplementary axle (see Figure 3-15).

7. Dismantle all nuts connected middle shell and front shell in the front shell (see figure

3-16), then dismantle the nut connected middle and front shells outside of the front

shell, maintain 2-3 nuts to keep the middle and front shell not split when it left (see

Figure 3-17).

8. Loose the four boles on the small housing and the two hollow bolt on air pipe of

range shift cylinder, dismantle small housing assembly (see Figure 3-18， Figure

3-19).

9. Make workbench ready for input shaft impending, put the transmission on the workbench and let the output flange of the transmission vertically and steadily

dropping on the workbench, take care for protection the ring ridge of front shell and

input shaft. Prize the locking plate of output shaft (see Figure 3-20), and dismantle

larger bolt (see figure 3-21) by special tools of G01 or G14 (cooperate with

pneumatic wrench).

10. Pull greasy blockage out by M10 bolt (see Figure 3-22), dismantle the tightening nut

of main axle in output shaft by extension bar bush (see Figure 3-23, before split

main gearbox from supplementary gearbox, it must firstly dismantle the

tightening nut of main axle, otherwise the main axle will be damaged), then

fasten the larger bolt.

11. Screw off connected bolt of PTO, and then take off the back shell of PTO by M10 top

thread (see Figure 3-24). Screw off connected bolt of front shell of PTO and back

shell of transmission; take off the front shell of PTO (see Figure 3-25).

12. Screw off bolt connected back and middle shell of transmission (see Figure 3-26),

prop up the back shell of transmission by M12 top thread (see Figure 3-27), then lift

up the supplementary assembly by lifter or rope and take off the assembly.

13. Take off the input shaft of PTO by gently copper hammer striking (see figure 3-28),

and put the supplementary gearbox and PTO into the clean place.

14. Screw five bolts of tightening lock plate in main gearbox (Figure 3-29 circle shown),

take off the lock plate, bolt, padding block, interlocking plate of main and

supplementary gearbox, lock plate pad and spring, and then take off clamp spring

outside of bearing on the two supplementary axle by using spring pliers (see Figure

3-30).

15. Bring the two idle wheel forward by pin removal G06 (Figure 3-31), then in the far

away place of supplementary axle direction to dial idle wheel to leave the position of

bearing on supplementary axle to avoid scraping between bearing of supplementary

axle and idle wheel when split front and middle shells.

16. Unscrew bolt connected filter screen end cover of transmission, take off end cover

and filter screen (see Figure 3-33) to avoid filter and gear scraping when lift up the

middle shell. Lift up the middle shell of transmission by M12 bolt, lift down the middle

shell and take off the oil pipe 1 in the box (see Figure 3-34)

17. Use special tool G05 to dismantle the bearing on the two supplementary axles (see

Figure 3-35), take off main axle and two supplementary axles (see Figure 3-36), and

turn over the front shell, dismantle input shaft assembly by copper bar or hammer.

We are the agency for SINOTRUK wholesale truck series, we can supply HOWO tractor trucks, HOWO dump trucks, trailer truck, truck parts, agricultural machinery, Construction machinery and parts,HOWO concrete mixer trucks, special trucks and so on.we can supply trucks for our clients with good quality and competitive price, because we get directly support from the CNHTC factory.

Main products

1. Dump Truck / Tipper Truck

2. Hohan tractor Truck/ prime mover truck

3. Truck with crane / Truck mounted crane

4. Oil Tank Truck / Fuel Tanker Truck

5. Water truck / Water Tank Truck / Water Sprinkler Truck

6. Concrete Mixer Truck

7. Van truck / Insulated truck/ Refrigeration truck

8. Fecal suction truck / Sewage suction truck

9. Cement Powder Tank truck/ Bulk cement trailer

10. High-altitude operation truck

11.Semi Trailer ( flat bed trailer / skeleton trailer / dump trailer / side wall trailer / low bed trailer / container trailer, etc. )