HALE AP, Technical Manual

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larly, oil leaking from between the pump head and the gearbox is NOT typically the result of a
failed pump head but a failed O-ring and/or oil seal. However pump head removal is required to
repair either condition. Typically a pump head would NOT require replacement unless it has been
damaged by allowing the pump to freeze with water in it or by improper clearance ring removal.
This procedure ONLY applies when the pump head requires removal from the gearbox, other-
wise, use the instructions in paragraph 5.8.4.3 or 5.8.4.4 to remove the volute. If the pump is an
MBP, next remove the inducer, as described in paragraph 5.8.4.5. Then remove the impeller as
described in paragraph 5.8.4.6, 5.8.4.7, or 5.8.4.8 and the mechanical seal as described in par-
agraph 5.8.4.9. This process will leave the pump head isolated from the rest of the pump.
Refer to Table 35 for a list of tools and/or consumables required for this procedure.
Table 35. AP/CBP/MBP Pump Head R&R Tools And Consumables List
Standard Tools Special Tools Consumables
PPE (Eye and Hand Protection) None Shop Rag(s) (As Required)
3/4-in (19 mm) Wrench
(Or Ratchet Wrench)
(Or Pass Thru Ratchet)
O-RING, <040-1580-00-0>
(Pump Head to Gearbox)
(This O-ring is used for all three pumps.)
3/4-in (19 mm) Torque Wrench O-ring Lubricant (See Table 20)
AP Pump Head: (*)
<See FSG–PL–01483 Sheet 4 Item 10>
CBP Pump Head: (*)
<See FSG–PL–01482 Sheet 4 Item 11>
MBP Pump Head: (*)
<See FSG–PL–01486 Sheet 4 Item 13>
* (ONLY One Required – Select From:)
If ONLY the pump head remains attached to the gearbox, perform the following to remove and
replace the pump head.
Pump Head Removal
A. Remove pump head to gearbox retaining hardware.
Using a 3/4-in (19 mm) wrench loosen (CCW) four (4) M12 x 1.75 full 1.
nuts.
Remove four (4) M12 x 1.75 full nuts. 2.
Remove four washers. 3.
NOTE
Do NOT damage the pump shaft when removing the pump head.
B. Pull pump head off gearbox.
C. Remove gasket from mating surfaces.
Clean mating surfaces of pump head and volute. 1.
If mineral deposits are present, clean mating surfaces of pump head and 2.
gearbox.
D. Remove O- ring from pump head on gearbox side.