Komatsu 930E-2, Shop Manual

Page: 444 / 739

32. Insert bias control piston springs (1, Figure 6-14)
into control piston (11). Use four capscrews (1,
Figure 6-15) to fasten control cover cap to back of
valve plate. Tighten capscrews evenly to 138
ft.lbs. (187 N.m) torque.
33. Install O-ring (10) in rear of valve plate. Use four
capscrews (7) to fasten cover plate (9) over open-
ing in valve plate.
34. Pull free end of control link (17, Figure 6-14) toward
back of pump housing until the open hole in the
link lines up with open ports on sides of pump
case.
35. Install stroke adjuster assembly (Figure 6-17) to
hold swashblock in place.
Valve Plate Group
36. Be sure driveshaft bearing (13, Figure 6-15) is in
place. Using assembly grease (to hold desired
position), place valve plate gasket (12) in position
on valve plate (11).
37. Support valve plate assembly from an overhead
hoist (lifting lug holes are provided) in preparation
for mating to the pump housing.
38. Assemble one control link retainer ring (14, Figure
6-14) and one control link washer (15) onto the
threaded hole side of the control link pin (16). Then
thread a 1/4 in - 20 UNC capscrew into pin to ease
holding.
39. Carefully maneuver valve plate assembly, sup-
ported by overhead hoist, over driveshaft and into
pump housing so slot on control piston (11) en-
gages control link (17).
40. With hole in control piston lined up with hole in the
link, carefully insert control link pin (16).
Care should be taken during this next step to
prevent the washer and retaining ring from falling
into pump housing.
41. Install second control link washer (15) and control
link retaining ring (14) onto pin.
42. Once assembled, remove capscrew from pin.
NOTE: The valve plate is a slight press fit into pump
housing. Make sure pilot diameter on valve plate is
aligned with mating diameter on the pump housing
prior to assembly.
43. Insert four capscrews (8, Figure 6-15) and alter-
nately tighten until valve plate is drawn up to the
pump housing. Tighten capscrews evenly to 244
ft.lbs. (330 N.m) torque.
44. Install cover plate (9) with new O-ring (10) and
capscrews (7).
45. Install O-rings (2, 3 and 4, Figure 6-16) in proper
location on top of valve plate. Install block (10) to
valve plate with socket head capscrews (12) and
tighten to 183 in lbs (20.7 N.m) torque.
46. Install 4-way valve (11), and compensator valve
(16).
47. Install 0.062 in (1.575 mm) diameter orifice (9) and
plug (7) with new O-ring (8) in side of compensator
block as shown in Figure 6-15. Install 0.032 in
(0.813 mm) diameter orifice (15), plug (7) and
O-ring (8) in top of block.
48. Install remaining plugs with new O-rings.
49. Install unloader module (18) on compensator block
with new O-rings (19) and socket head capscrews
(17). Tighten capscrews to 87 in lbs (9.8 N.m)
torque.
50. Install plugs (9 & 24, Figure 6-13) and O-rings (10
& 25) in pump housing.
51. Measure pump rotation torque. Rotation torque
should be approximately 15 ft. lbs. (20.4 N.m).
FIGURE 6-18. O-RING LOCATION ON PISTON
SLEEVE
1. Back-Up Ring
2. O-Ring
3. Back-Up Ring 4. O-Ring
5. Back-Up Ring
L6-22 Steering Circuit Component Repair L06021