Giant P46HT User Manual

Model
P46HT

Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service
Manual

Updated 3/98

Contents:

Installation Instructions: page 2
Pump Specifications: page 3
Exploded View: page 4
Kits/Torque Specs: page 4
Parts List: page 5
Trouble Shooting: page 6
Repair Instructions: page 7
Dimensions: back page
Warranty Information: back page

REPAIR INSTRUCTIONS - P46HT

1. To Check Suction and Discharge Valves
Loosen valve plugs (41 and 43) using a socket wrench. Note the arrangement for
reassembly and check the discharge valves underneath and suction valves (in
suction valve adapter 39).

2. To Check V-Sleeves
Separate valve casing (29) from the crankcase (1) and pull off over the plungers. If
the seals have to be replaced, remove all parts from the valve casing (29) in the
suction valve direction. Grease new v-sleeves (31) with grease before installing.
Examine the surfaces of the plunger pipes (24A) as damaged surfaces cause the
seals to wear out quickly.

3. To Check Plungers and Crankcase
If oil leaks at plunger outlet (22), and or the radial shaft seal (26), the worn plungers
and crosshead (plunger assembly) must be placed. Drain oil and remove crank­case cover (3) and valve casing (29). Take off bearing cover (12) and shaft protec­tor (17) on one side before removing the crankshaft (18). Then remove crankshaft
axially by means of a press or a rubber hammer. Do not force the cranks on the
shaft when pulling through the connecting rod (20). Do not bend connecting rod.
Dismantle crosshead and connecting rod and replace worn parts.
Reinstall the crankshaft first being particularly careful with the cranks. Then press on
the bearing on both sides and finally install radial shaft seal and bearing cover.

4. To Replace Plunger Pipes
Screw out tension screw (24B), pull off plunger pipes (24A) and clean plunger
surface. Install new plunger pipe. Fix tension screw with screw-glue and tighten
carefully at 106 ft.-lbs.

5. Drip-Return
After the valve casing has been removed, the weep seals (50) in the intermediate
casing (46) can be examined and replaced as necessary. Should lime deposits
occur in the valve casing, care must be taken in keeping the two holes in the valve
casing (29) free to ensure trouble-free drip-return.

NOTE: Contact Giant Industries for Service School Information. Phone: [phone]

2

PUMP SYSTEM MALFUNCTION

MALFUNCTION

The Pressure and/or
the Delivery Drops

Water in crankcase

Noisy Operation

CAUSE

Worn packing seals
Broken valve spring
Belt slippage
Worn or Damaged nozzle
Fouled discharge valve
Fouled inlet strainer
Worn or Damaged hose
Worn or Plugged relief valve on pump
Cavitation

Unloader

High humidity
Worn seals

Worn bearings

Cavitation

REMEDY

Replace packing seals
Replace spring
Tighten or Replace belt
Replace nozzle
Clean valve assembly
Clean strainer
Repair/Replace hose
Clean, Reset, and Replace worn parts
Check suction lines on inlet of
pump for restrictions
Check for proper operation

Reduce oil change interval
Replace seals

Replace bearings, Refill crankcase
oil with recommended lubricant
Check inlet lines for restrictions
and/or proper sizing

Rough/Pulsating
Operation with
Pressure Drop

Pressure Drop at
Gun

Excessive Leakage

Worn packing
Inlet restriction

Accumulator pressure
Unloader
Cavitation

Restricted discharge plumbing

Worn plungers
Worn packing/seals
Excessive vacuum
Cracked plungers
Inlet pressure too high

Replace packing
Check system for stoppage, air
leaks, correctly sized inlet plumbing
to pump
Recharge/Replace accumulator
Check for proper operation
Check inlet lines for restrictions
and/or proper size

Re-size discharge plumbing to
flow rate of pump

Replace plungers
Adjust or Replace packing seals
Reduce suction vacuum
Replace plungers
Reduce inlet pressure

High Crankcase
Temperature

Wrong Grade of oil
Improper amount of oil in crankcase

3

Giant oil is recommended
Adjust oil level to proper amount