JLG 600SC_660SJC Service Manual - Manual (Page 137)

SECTION 5 - CAT CHASSIS (S/N 0300128000 TO PRESENT)
3121157 – JLG Lift – 5-45
Maintenance Standards For Disassembled Parts
Wash all parts disassembled in treated oil, and dry them with compressed air. Perform maintenance including replacement
or corrections in accordance with the following criterion.
Motor Maintenance
Parts Name Appearance Standard Value Allowance Replacement Parts
Piston sub assembly (15) When remarkable flaws or high surface
roughness are found on each sliding
surface *** *** Cylinder block kit
When clearance between piston sub
assembly and cylinder block bore is
great 0.03 0.06
When looseness in shoe ball parts is
great 0.15 0.4
Cylinder block (7) When remarkable flaws or high surface
roughness are found on each sliding
surface Roughness 0.2 a There should be no seizure
and remarkable flaws (over
0.02 mm in thickness).
Cylinder block kit / Perform
lapping (#1000). Replace if
flaws cannot be completely
removed.
When wear inside bore is great *** ***
When abnormal wear and breakage
develop on mating teeth *** ***
Valve plate - 26 When remarkable flaws or high surface
roughness are found on each sliding
surface Roughness 0.2 a Roughness 0.8 a There
should be no seizure and
remarkable flaws (over 0.02
mm in thickness). Cylinder block kit / Perform
lapping (#1000). Replace if
flaws cannot be completely
removed.
Retainer plate (14) / Retainer
holder (13) When remarkable flaws or high surface
roughness are found on each sliding
surface Roughness 0.2 a Roughness 0.8 a Retainer plate kit
Swash plate (5) When remarkable flaws or high surface
roughness are found on each sliding
surface Roughne ss 0.2 a Roughness 0.8 a There
should be no remarkable
flaws (over 0.02 mm in thick-
ness).
Swash plate / Steel ball / Per-
form lapping (#1000).
Replace if flaws cannot be
completely removed.
When remarkable flaws or seizure are
found on contact surface with steel balls
(10) Ball depth 14.3 14.5
Shaft (2) When remarkable flaws or high surface
roughness are found on sliding surface
of oil seal (21) Roughne ss 0.8 a Roughness 1.6 a Shaft
When abnormal wear and breakage
develop on mating teeth *** ***
Brake piston (17) When remarkable flaws or high surface
roughness are found in each sliding sur-
face Wear amount 0
Roughness 1 a 0.3
2.5a
Brake piston / Friction plate
Disk plate (16) When remarkable flaws or abrasion are
found on disks (friction material) Thicknes s 3.5 3.2 Disk plate