Disassembling Gear Case - Yamabiko ECHO SRM-420ES Service Manual

SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS

7-2 Disassembling gear case

A
E
J
CUTTER DRIVE SYSTEM
B
C
D
F
G
H
h1
h2
h3
1. Check gear case for cracks and PTO shaft for
smooth rotation. Disassemble gear case as follows
if defective.
2. Remove nylon line head from PTO shaft, and
gear case (A) from drive shaft housing. Remove
cover plate, adaptor plate and blade fixture from
PTO shaft.
3. Remove bolt (B) with torsion spring and wash-
er.
4. Remove retaining ring (C) using needle nose
pliers.
5. Heat up the middle of gear case with a heat
gun (D) as shown, then tap gear case with a cup (E)
of bearing tool set 897701-14732 vertically against
a fl at surface (F) several times until drive gear with
two ball bearings (SRM-420TES, T410TS and
B410TS: three ball bearings) come out.
WARNING
When using a heat gun, put on gloves.
Otherwise, a burn will result.
6. Remove retaining ring (G) from the groove of
gear case using pliers, then remove the washer.
7. Connect PTO shaft puller P021-044870 (H) with
connector (h1) to PTO shaft (J) as shown. Then
strike weight (h2) to nut (h3) holding gear case, to
pull out PTO shaft together with the relevant parts.
NOTE: Do not let go of weight (h2) while using it.
Puller and PTO shaft may fl y out, and cause dam-
age.
8. Check gears, PTO shaft, and ball bearings. If
worn or hard rotation is found, replace the defec-
tive parts as required.
51 51
DANGER