8
SECTION F: SERVICE AND REPAIR
NOTE: All item numbers in ( ) refer to Figures 7 & 8 and 9 & 10
For 2 Stage Models.
WARNING ! - Hydraulic power to the pump must be
disconnected to prevent personnel danger before
any service work is done to the pump.
F-1) Lubrication:
F-1.1) Checking Oil:
To check oil, remove pipe plug (18) from diff user (9). With a
fl ashlight, visually inspect the oil in the seal cavity to make
sure it is clean and clear, light amber in color and free from
suspended particles. Milky white oil indicates the presence of
water. If the the oil looks milky white, pour the oil out of the oil
chamber and let it settle in a clean, dry container. If any water
settles out in the bottom of the container or if the oil is white
and thick (emulsifi ed) replace rotary shaft seals (See Section
F-4) and oil.
You can also check oil for contamination by using an oil tester
with a range to 30 Kilovolts breakdown. If oil is found to be
clean and uncontaminated (measure at or above 15 KV.
breakdown), refi ll the seal cavity. If oil is found to be dirty or
contaminated (or measures below 15 KV. breakdown), replace
rotary seals and oil.
TABLE 1 - SEAL CHAMBER OIL
SUPPLIER
GRADE
Gulf
(334206) Harmony 68
Texaco
URSA P-68
F-1.2) Replacing Oil:
Remove pipe plug (18) from diff user (9), and drain oil from
seal chamber and dispose of properly. Flush inside seal
chamber of diff user (9) thoroughly to be sure it is clean
and free of abrasives. Refi ll oil chamber (See Parts List for
amount), or about half full, of a 20W non-detergent turbine oil
with rust and oxidation inhibitors, See Table 1. After replacing
oil, replace pipe plug (18) using a sealant.
F-1.3) Seal Cavity Pressure Test:
Remove pipe plug (18) from diff user (9) and check that the
seal chamber is of the correct amount of oil (See Figure 2).
Apply pipe sealant to pressure gauge assembly and tighten
into hole in Intermediate diff user (9). Pressurize seal chamber
to 12 P.S.I. and check for leaks. If after fi ve minutes, the
pressure is still holding constant, and no leaks are observed,
slowly bleed the pressure and remove the gauge assembly.
Replace the pipe plug (18) using a sealant. If the pressure
does not hold, then the leak must be located and repaired.
CAUTION ! - Always wear eye protection when
working on pumps.
CAUTION ! - Pressure builds up extremely fast,
increase pressure by “TAPPING” air nozzle. Too
much pressure will damage seal. DO NOT exceed
12 P.S.I.
F-2) Impeller Service:
F-2.1) Disassembly:
- (See Fig’s 7 & 8)
On 7-08 single stage models, to inspect or replace impeller
(3) and impeller o-ring (43), remove screws (40) and remove
strainer (24). Remove capscrews (32), fl atwashers (30) and
brackets (41) then remove suction case (4). On 7-06 models,
remove capscrews (32), fl at washers (30) strainer (24) and
suction case (4). Check the suction case (4) lining for wear,
cuts, or defects and replace if necessary. Now remove
locknuts (16) and washer (27) from shaft. The impeller (3)
should slip off the shaft, if not, remove the o-ring (43) from
the impeller groove and use a bearing puller. Inspect the
impeller for wear or damage, also check shims (17a) & (17b)
and replace if necessary.
NOTE:
Seal spring relaxes when
impeller is removed and may cause oil to leak through.
2-STAGE MODELS:
(See Fig’s 9 & 10) To inspect or replace
impellers (3) and impeller o-rings (43), remove screws (40)
and remove strainer (24). Remove cap screws (32), fl at
washers (30) and brackets (41) then remove suction case (4).
Check suction case (4) lining for wear, cuts, or defects and
replace if necessary. Now remove locknut (16) and washer
(27) from shaft. The outer impeller (3) should slip off the shaft,
if not, remove the o-ring (43) from the impeller groove and
use a bearing puller. Inspect the impeller for wear or damage,
remove shims (17a), (17b), (17c), spacer (45), keys (15),
lower diff user (46), replace if necessary. The inner impeller
(3) should slip off the shaft, if not, remove the o-ring (43) from
the impeller groove and use a bearing puller. Inspect the
impeller for wear or damage, remove shims (17a), (17b) and
(17c). Seal spring relaxes when impeller is removed and may
cause oil to leak through.
CAUTION ! - Clean all parts with solvent. DO NOT
scrape, sand or
fi
le aluminum parts.
FIGURE 2
