JLG 600SC_660SJC Service Manual - Manual (Page 53)

SECTION 3 - CHASSIS & TURNTABLE
3121607 – JLG Lift – 3-17
HYDRAULIC MOTOR PARTS REPLACEMENT CRITERIA
Item Inspection Allowable Limit Parts to be Replaced
Piston Assy (106) (a) Deep score or roughness on shoe.
(b) Deep score or roughness on reciprocating portion.
(c) Large clearance between Piston and Cylinder Block.
(d) Play on shoe ball portion. 0.8a
1.2a
0.060mm
0.40mm Cylinder Block Kit (B6)
Cylinder Block (104) (a) Deep score or roughness on sliding portion.
(b) Deep score or roughness inside bore.
(c) Large clearance between Piston.
(d) Large clearance between Shaft spline. 0.8a
1.6a
0.060mm
38.749(pin dia.3.333) Cylinder Block Kit (B6)
Valve Plate (105) (a) Roughness of the sliding portion or deep scoring caused by
serious damage, seizure, and partial wear. 0.8a
<0.02mm(scoring depth) Valve Plate (105)
Retainer Plate (107)
Retainer Holder (108) (a) Roughness of the sliding portion or deep scoring caused by
serious damage, seizure, and partial wear. 0.8a
<0.02mm(scoring depth) Retainer Plate (107)
Retainer Holder (108)
Swash Plate (109) (a) Roughness of the sliding portion or deep score caused by damage, seizure, and
wear.
(b) Deep scoring or roughness on Steel Ball portion.
(c) Depth of Steel Ball portion. 0.8a
<0.02mm(scoring depth)
1.6a
14.5mm Swash Plate (109)
Steel Ball (110)
Shaft (103) (a) Deep lip mark, roughness, or serious damage on sliding
portion for Oil Seal.
(b) Excessive wear or breakage on spline
(c) Large clearance between Cylinder Block spline hole.
(d) Large clearance between Coupling spline hole. 1.6a
<0.02mm(scoring depth)
47.380(pin dia.3.000
30.498(pin dia.3.33) Shaft (103)
Brake Piston (125) (a) Dimension
(b) Roughness or serious damage on sliding portion. 45.7mm (Height)
2.5a Brake Kit (125)
Disk Plate (127) (a) Dimension
(b) Serious damage or peeling. 3.2 (Thickness) Brake Kit (127)
Ball Bearing (112), (113) (a) Serious damage on races and Balls.
(b) Discontinuous rotation Ball Bearing (112), (113)
Piston Assy (111) (a) Deep score or roughness on shoe.
(b) Deep score or roughness on reciprocating potion.
(c) Large clearance between Piston and Flange Holder.
(d) Play on shoe ball portion. 1.6a
1.2a
0.040mm
1.0mm Case Kit (B7)
Plunger Assy (102-2) (a) Serious damage, roughness, or deep scoring.
(b) Large clearance between Plunger and bore. 0.8a
<0.02mm(scoring depth)
0.060mm Base Plate Kit (B5)
Base Plate (102) (a) Serious damage, roughness, or deep scoring on bore. 0.8a
<0.02mm(scoring depth) Base Plate Kit (B5)
Spool (102-9) (a) Serious damage, roughness, or deep scoring.
(b) Large clearance between Spool and bore. 0.8a
0.060mm Base Plate Kit (B5)
Relief Valve Assy (102-7) (a) Roughness or serious damage on Free Piston sliding <0.02mm(scoring depth) Relief Valve Assy (B4)