Charge Pump - JLG 1850SJ Service And Maintenance Manual

INSPECTION
1. Inspect the shaft journals for wear, scratching, and pits.
Check the splines for fretting; replace if damaged.
Rotate the bearing, if it does not rotate smoothly,
replace it.
REASSEMBLY
1. Press the bearing (J150) onto the shaft (J100) and
replace the retaining ring (J200). Ensure the retaining
ring diameter is less than 38.84 mm [1.53.in] when
installed on the shaft.
2. Install the shaft/bearing assembly into the pump.
3. Lubricate and install a new O-ring (J260) onto seal car-
rier (J275). Press a new seal (J250) into the seal carrier.
Press the seal until it is flush within +0.12mm [0.005 in]
or -0.72 mm [0.0028 in] of the inside lip of the carrier: see
illustration.
Press ?ush to this sur face
+0.12 mm [ 0.005 in] / -0.72 mm [ 0.028 in]
Seal
4. Cover the shaft with a protective sleeve while installing
the seal carrier. Hand press the seal carrier into the hous-
ing. Ensure the seal carrier clears the spiral ring groove
in the housing. Remove the protective sleeve.
5. Wind the spiral ring into the housing. Ensure the inside
diameter of the spiral ring is greater than 68 mm [2.677
in] after installation.
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SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS

Charge Pump

NOTE: Note position of alignment pin (S500) in housing. Align-
Position pump with front shaft pointing downward. Attach
securely to a proper work stand. If an auxiliary pump is
attached, remove auxiliary pump before servicing charge
pump.
REMOVAL
1. Remove screws (K351), and hangers (K975).
2. Remove running cover (K301). Remove and discard seal
ring (K250).
3. Using a 10 mm internal hex, remove screws (K400).
Remove cover (K101).
4. Remove charge pump assembly with shaft.
ment pin position will change for clockwise or counter-
clockwise rotation.
5. Remove and discard seal (S300).
6. Using a snap ring pliers, remove two clips (K205).
7. Remove geroter cover (S200). Remove geroter assembly
(S100).
8. Remove and discard gasket (K151). Remove alignment
pins (K450).
9. If it is necessary to remove housing (K300), use a 10 mm
internal hex to remove screws (K350).
10. Remove housing (K300).
11. Remove and discard seal (K150).
INSPECTION
1. Inspect all machined surfaces. If you find any nicks or
scratches, replace the component.
2. Inspect geroter and cover for wear or damage. If wear or
damage is found, replace geroter kit.
3. Inspect shaft for wear or damage. If found, replace shaft.
4. Inspect journal bearings in aux pad and housing. If worn
or damaged, replace journal bearings or aux pad or
housing assembly.
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