Terex TS14G, Maintenance Manual

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Section 220-0090
SM 1765 2-99
5
9. Remove plug (8) and ‘O’ ring (7) from valve body
(6). Discard ‘O’ ring (7).
10. Remove nut (20) and one washer (22). Loosen
jam nut (21) and back off adjusting screw (23) to
release compression of spring (26), then remove
adjusting screw (23), jam nut (21), second washer (22)
and cap (24). Remove poppet spring (26) and poppet
(27) from valve body (6). Remove and discard ‘O’ ring
(25) from cap (24).
11. Remove cap (36), spring (34) and check (33) from
valve body (6). Remove and discard ‘O’ ring (35) from
cap (36).
12. Insert a soft metal rod, with a diameter of 6.4 mm
(0.25 inches) into valve body (6) from cap (36) side,
through bore in seat (32) and push out check (31),
spring (30) and seat (28). Remove and discard ‘O’ ring
(29) from seat (28). Insert rod through cap (24) side of
valve body (6) and push out plunger seat (32).
13. Clamp lock plunger (18) in a soft-jawed vice and
remove retaining ring (12), plugs (14), springs (15) and
poppets (17) from ends of lock plunger. Remove and
discard ‘O’ rings (13) from plugs (14).
INSPECTION
Numbers in parentheses refer to Figs. 1 & 2.
1. Clean all parts with a suitable solvent and dry with a
clean lint free cloth or compressed air.
2. Inspect valve and poppet seat for scoring, eroding,
or out-of-round. The seat must have sharp edges.
Check the seating surfaces on valves and poppets for
defects that may cause leakage. Replace if the
surfaces are eroded or show excessive wear and
prevent proper seating.
3. Inspect the valve body (6) bores, spool (47) and
lock plunger (18) for grooves, deep scoring, or wear.
Check the spool and plunger for flaking of the chrome
plating. For inspection purposes, coat them with clean
hydraulic oil and install them in their respective bores
in the valve body (6). While rotating them, work the
spool and plunger in and out as in actual operation to
determine the extent of wear and to see if they fit
without binding. If the fit is too loose or if there is
damage, valve body and plungers MUST be replaced
as an assembly.
ASSEMBLY
Numbers in parentheses refer to Fig. 1 & 2.
Note:
Lubricate the bore of steering valve body (6)
and all parts with hydraulic oil to facilitate assembly.
Refer to Section 300-0020, LUBRICATION SYSTEM
for oil specification.
1. Clamp lock plunger (18) horizontally in a soft-jawed
vice.
2. Install poppet (17) and spring (15) in retaining
groove end of lock plunger (18). Install new ‘O’ ring
(13) on plug (14). Position plug (14) over spring (15)
and install into lock plunger (18). Install retaining ring
(12) in lock plunger. Repeat for opposite end of lock
plunger (18).
3. Coat lock plunger (18) with hydraulic oil and install
in valve body (6).
4. Install new ‘O’ ring (11) on cap (10) and thread cap
(10) into valve body (6). Tighten cap (10) until it
bottoms against the housing.
5. Install new ‘O’ ring (11) on cap (19) and thread cap
(19) into valve body (6). Make sure that plug (14)
seats properly in lock plunger (18). Tighten cap (19)
until it bottoms against the housing.
6. Clamp spool (47) in a soft-jawed vice with the link
bar end down.
7. Position one washer (40), spring (42), spacer (41),
second washer (40) and washer (39) over end of spool
(47). Clean threads of spool and nut (38) making sure
the threads are free of oil and apply Loctite, or suitable
equivalent to the threads. Install nut (38) on spool (47)
and torque tighten to 70 - 80 Nm (50 - 60 lbf ft),
lubricated.
8. Install new seal (46) and washer (45) in groove on
cover (9) side of valve body (6) and new seal (46) on
wiper (48) side of valve body (6).
9. Remove spool (47) from vice and coat with
hydraulic oil. Slide plate (43) and shims (37 & 44) over
link bar end of spool (47) until they contact washer
(40). Carefully slide spool (47), link bar end first,
through bore in valve body (6) making sure seal (46)
and washer (45) are not dislodged from their grooves.
Steering System - Steering Valve
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